What pushed shooter to kill?

Lois Barber of Newtown, Conn., left, embraces her daughter Lisa in their home, as she became overcome with emotion reflecting on yesterdayâÄôs tragic shooting at Sandy Hook Elementary School, which Lisa once attended.

Photo: Will Waldron, Hearst Connecticut Newspapers/Wi

Lisa Barber, age 20 and her brother Luke of Newtown Conn., look through a 2004 Newtown High School yearbook on Saturday, dec. 15, 2012, seaching for photos of the Lanza brothers. Adam Lanza, age 20, was identified by authorities as the killer who fatally shot his mother in her home before gunning down 20 children and 6 adults at Sandy Hook Elementary School in Newtown Conn.

Photo: Will Waldron, Hearst Connecticut Newspapers/Wi

Fairfield teacher Jane Vigliotti, of Stratford, attends a candlelight vigil with hundreds of others in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Ted Kowalczuk, of Milford, and his friend Rachel Schiavone, of Norwalk, attend a candlelight vigil held behind Stratfor High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Kowalczuk and Schiavone were close friends to Stratford High graduate Vicki Soto, who was killed in yesterday's mass shooting at Sandy Hook Elementary School in Newtown. Soto was a teacher at the school where 27 people died. Photo: Christian Abraham

Father Peter Paproski, of St. John's Orthodox Church, offers up a prayer to several people as hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Stratford High School senior Caitlyn Larocque, front, sheds a tear as she and hundreds of others attend a candlelight vigil, in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Father Peter Paproski, of St. John's Orthodox Church, offers up a prayer to several people as hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Fairfield teacher Jane Vigliotti, of Stratford, at right, lights extra candles she brought to hand out as hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. At left is her friend and fellow teacher Gladys Ramos, who teaches at St. James School in Stratford. Photo: Christian Abraham

Connecticut State Police Lieutenant Paul Vance addresses a press conference on the situation following an elementary school shooting in Newtown, Connecticut, on December 15, 2012. The residents of an idyllic Connecticut town were reeling in horror from the massacre of 20 small children and six adults in one of the worst school shootings in US history. The heavily armed gunman shot dead 18 children inside Sandy Hook Elementary School, Vance said. Two more died of their wounds in hospital. Photo: EMMANUEL DUNAND, AFP/Getty Images

A man places a bunch of balloons to a make-shift memorial at the sign for the Sandy Hook Elementary School in Newtown, Conn. Saturday, Dec. 15, 2012. Photo: Carol Kaliff

Christmas trees are carried from a near-by firehouse, placed and then decorated along the road leading to the Sandy Hook Elementary School in Newtown, Conn. Saturday, Dec. 15, 2012. Photo: Carol Kaliff

Mourners leave flowers, balloons and notes around the sign for the Sandy Hook Elementary School in Newtown Saturday, Dec. 15, 2012. The day before, a gunman opened fire killing 28 people including himself and 20 children at the school. Photo: Carol Kaliff

A woman and children pay their respects at a memorial setup at the sign for the Sandy Hook Elementary School Saturday, Dec. 15, 2012 in Newtown, Conn. Photo: Carol Kaliff

Jillian Soto, center, thanks the hundreds of people who came out to attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Jillian's sister Vicki, a Stratford native, was a teacher at Sandy Hook Elementary School and was one of the victims in the shooting. At left is sister Carly Soto and family friend Louis Sanchez. Photo: Christian Abraham

A memorial has been created near the site of the mass shooting at Sandy Hook Elementary School in Newtown Saturday Dec. 15, 2012. Photo: Michael Duffy

A memorial has been created near the site of the mass shooting at Sandy Hook Elementary School in Newtown Saturday Dec. 15, 2012. Photo: Michael Duffy

Signs in front of a house near the site of the mass shooting at Sandy Hook Elementary School express neighborhood feelings in Newtown Saturday Dec. 15, 2012. Photo: Michael Duffy

Mourners place flowers on a memorial built around the sign for the Sandy Hook School in Newtown Saturday, Dec. 15, 2012. Sandy Hook Elementary School was the site of a mass shooting on Friday. Photo: Michael Duffy

Members of the Sandy Hook Volunteer Fire Department decorate Christmas trees along Dickenson Drive leading to the Sandy Hook Elementary School in Newtown Saturday, Dec. 15, 2012. The school was the site of a mass shooting on Friday. Photo: Michael Duffy

Members of the Sandy Hook Volunteer Fire Department decorate Christmas trees along Dickenson Drive leading to the Sandy Hook Elementary School in Newtown Saturday, Dec. 15, 2012. The school was the site of a mass shooting on Friday. Photo: Michael Duffy

Nicole and Mark Jones, of Danbury, place flowers on a memorial built around the sign for the Sandy Hook School in Newtown Saturday, Dec. 15, 2012. Sandy Hook Elementary School was the site of a mass shooting on Friday, one of the victims was their cousin's daughter. Photo: Michael Duffy

Mourners react after placeing flowers on a memorial built around the sign for the Sandy Hook School in Newtown Saturday, Dec. 15, 2012. Sandy Hook Elementary School was the site of a mass shooting on Friday. Photo: Michael Duffy

Hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Tenor saxophonist Jimmy Greene with his family, son, Isaiah, wife, Nelba, and daughter, Ana Grace. Six-year-old Ana Grace was one of the 20 children killed in the Sandy Hook Elementary School shooting in Newtown, Conn. on Friday, Dec. 14, 2012. Photo: Ottawacitizen.com Photo

Hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

A candle memorial was laid out on the sidewalk by Nancy Orengo and her partner Nicki, as hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Stratford High School student Eva Juarez places a few roses in front of a candle memorial put together by Nancy and and her partner Nicki Orengo, at right, as hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Stratford High School student Eva Juarez placed these roses in front of a candle memorial made by Nancy and and her partner Nicki Orengo, as hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Stratford High School seniors Ally Kutzer and Caitlyn Larocque, center front, attend a candlelight vigil with hundreds of other in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Nancy Orengo and her partner Nicki, at right, look at a candle memorial they laid out on the sidewalk, as hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Nancy Orengo and her partner Nicki, at center right, look at a candle memorial they laid out on the sidewalk, as hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Stratford High School seniors Ally Kutzer and Caitlyn Larocque, center front, attend a candlelight vigil with hundreds of other in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Hundreds attend a candlelight vigil in memory of victims from yesterday's mass shooting in Newtown, which was held behind Stratford High School on the Town Hall Green in Stratford, Conn. on Saturday December 15, 2012. Photo: Christian Abraham

Crosses are set at the Copacabana Beach in Rio de Janeiro, Saturday, Dec. 15, 2012, in memory of the school shooting victims in Newtown, Conn. Photo: Silvia Izquierdo

Dr. Steve Wruble, a trauma psychiatrist from NJ, wipes a tear from his eye while reflecting on yesterdayâÄôs tragedy at Sandy Hook Elementary School, Saturday morning Dec. 15, 2012, in Newtown, Conn. Twenty-seven people including 20 children were killed by a lone gunman yesterday at the school. Photo: Will Waldron, Hearst Connecticut Newspapers/Wi

A cross and a U.S. flag are set at the Copacabana Beach in Rio de Janeiro, in memory of the school shooting victims in Newtown, Conn., Saturday, Dec. 15, 2012. Photo: Silvia Izquierdo

A sympathetic man accompanied by a young boy came to place flowers next to the Sandy Hook Elementary School sign in newtown , Conn. on Saturday morning Dec. 15, 2012. Twenty children and six adults were killed by a gunman yesterday at the school. Photo: Will Waldron, Hearst Connecticut Newspapers/Wi

A cameraman is pushed aside as a sympathetic man accompanied by a young boy leaves Sandy Hook Elementary School after the pair placed flowers at the entrance to the school, Saturday Dec. 15, 2012, in Newtown, Conn. Twenty-seven people including 20 children were killed by a lone gunman yesterday at the school. Photo: Will Waldron, Hearst Connecticut Newspapers/Wi

Dr. Steve Wruble, a trauma psychiatrist from NJ reflected on yesterdayâÄôs tragedy at Sandy Hook Elementary School after placing flowers by a sign in Newtown Conn., Saturday morning Dec. 15, 2012. Twenty-seven people including 20 children were killed by a lone gunman yesterday at the school. Photo: Will Waldron, Hearst Connecticut Newspapers/Wi

Mourners set up a memorial in the back of St. Rose of Lima Church in Newtown, Conn. on Saturday, Dec. 15, 2012, offering their condolences to those who lost loved ones in the Sandy Hook Elementary School massacre yesterday. Photo: Elizabeth Kim, Hearst Connecticut Newspapers/Li

Congregants arrive for a prayer service at Adath Israel, in Newtown, Conn. Dec. 15th, 2012, the day after the mass shooting at Sandy Hook Elementary School where 27 people were killed. Photo: Ned Gerard

Gov. Dannel Malloy and Lt. Gov. Nancy Wyman leave Adath Israel following a Saturday prayer service in Newtown, Conn. Dec. 15th, 2012, the day after the mass shooting at Sandy Hook Elementary School where 27 people were killed. Photo: Ned Gerard

Congregants arrive for a prayer service at Adath Israel, in Newtown, Conn. Dec. 15th, 2012, the day after the mass shooting at Sandy Hook Elementary School where 27 people were killed. Photo: Ned Gerard

A family leaves Adath Israel following a Saturday prayer service in Newtown, Conn. Dec. 15th, 2012, the day after the mass shooting at Sandy Hook Elementary School where 27 people were killed. Photo: Ned Gerard

Rabbi Shauel Praver speaks at a press conference at Adath Israel following a Saturday prayer service in Newtown, Conn. Dec. 15th, 2012, the day after the mass shooting at Sandy Hook Elementary School where 27 people were killed. Photo: Ned Gerard

A couple embraces as they participate in a prayer meeting at the Heaven Ice Cream shop, Friday, Dec. 14, 2012 in Newtown, Conn. A gunman walked into the school Friday and opened fire, killing 26 people, including 20 children. Photo: AP

Lt. J. Paul Vance of the Connecticut State Police conducts a news briefing, Saturday, Dec. 15, 2012 in Newtown, Conn. The massacre of 26 children and adults at Sandy Hook Elementary school elicited horror and soul-searching around the world even as it raised more basic questions about why the gunman, 20-year-old Adam Lanza, would have been driven to such a crime and how he chose his victims. Photo: Jason DeCrow

An American flag flies at half-staff as dawn breaks, Saturday, Dec. 15, 2012 in Newtown, Conn. A gunman walked into Sandy Hook Elementary School in Newtown Friday and opened fire, killing 26 people, including 20 children. Photo: AP

A U.S. flag flies at half-staff on Main Street in honor of the people killed when a gunman opened fire inside a Connecticut elementary school, Saturday, Dec. 15, 2012, in Newtown, Conn. Photo: AP

White balloons decorate the sign for the Sandy Hook Elementary School as a Connecticut State Trooper stands guard at the school's entrance, Saturday, Dec. 15, 2012, in Newtown, Conn. A gunman killed his mother at their home and later walked into Sandy Hook Elementary School Friday and opened fire, killing 26 people, including 20 children. Photo: AP

A Connecticut State Trooper stands guard at the entrance to the Sandy Hook Elementary School, Saturday, Dec. 15, 2012, in Newtown, Conn. A gunman killed his mother at their home and later walked into Sandy Hook Elementary School Friday and opened fire, killing 26 people, including 20 children. Photo: AP

White balloons decorate the sign for the Sandy Hook Elementary School, Saturday, Dec. 15, 2012, in Newtown, Conn. A gunman killed his mother at their home and later walked into Sandy Hook Elementary School Friday and opened fire, killing 26 people, including 20 children. Building in background is the Sandy Hook fire department. Photo: AP

A basketball hoop is seen behind the Sandy Hook Elementary School as police flood lights light up the sky, Saturday, Dec. 15, 2012, in Sandy Hook, Conn. A gunman killed his mother at their home and later walked into Sandy Hook Elementary School Friday and opened fire, killing 26 people, including 20 children. Photo: AP

A Connecticut State Troopers stand guard at the entrance to the Sandy Hook Elementary School, Saturday, Dec. 15, 2012, in Newtown, Conn. A gunman killed his mother at their home and later walked into Sandy Hook Elementary School Friday and opened fire, killing 26 people, including 20 children. Photo: AP

A message board stands in the entrance to the St. Rose of Lima Roman Catholic Church, Saturday, Dec. 15, 2012, in Newtown, Conn. A man killed his mother at their home and then opened fire Friday inside the elementary school where she taught, massacring 26 people, including 20 children, as youngsters cowered in fear to the sound of gunshots reverberating through the building and screams echoing over the intercom. Photo: AP

A U.S. flag is reflected in a church window while flying at half-staff on Main Street in honor of the people killed when a gunman opened fire inside a Connecticut elementary school, Saturday, Dec. 15, 2012, in Newtown, Conn. Photo: AP

Mourners look in from outside during a vigil service for victims of the Sandy Hook Elementary School shooting, at the St. Rose of Lima Roman Catholic Church in Newtown, Conn. Friday, Dec. 14, 2012. A man killed his mother at their home and then opened fire Friday inside the elementary school where she taught, massacring 26 people, including 20 children, as youngsters cowered in fear to the sound of gunshots reverberating through the building and screams echoing over the intercom Photo: AP

Mourners gather for a vigil service for victims of the Sandy Hook Elementary School shooting, at the St. Rose of Lima Roman Catholic Church in Newtown, Conn. Friday, Dec. 14, 2012. A man killed his mother at their home and then opened fire Friday inside the elementary school where she taught, massacring 26 people, including 20 children, as youngsters cowered in fear to the sound of gunshots reverberating through the building and screams echoing over the intercom Photo: AP

U.S. Sen. Richard Blumenthal speaks to mourners at a vigil service for victims of the Sandy Hook Elementary School shooting, at the St. Rose of Lima Roman Catholic Church in Newtown, Conn. Friday, Dec. 14, 2012. A man killed his mother at their home and then opened fire Friday inside the elementary school where she taught, massacring 26 people, including 20 children, as youngsters cowered in fear to the sound of gunshots reverberating through the building and screams echoing over the intercom Photo: AP

Mourners gather for a vigil service for victims of the Sandy Hook Elementary School shooting, at the St. Rose of Lima Roman Catholic Church in Newtown, Conn. Friday, Dec. 14, 2012. A man killed his mother at their home and then opened fire Friday inside the elementary school where she taught, massacring 26 people, including 20 children, as youngsters cowered in fear to the sound of gunshots reverberating through the building and screams echoing over the intercom Photo: AP

Mourners gather inside and outside for a vigil service for victims of the Sandy Hook Elementary School shooting, at the St. Rose of Lima Roman Catholic Church in Newtown, Conn. Friday, Dec. 14, 2012. A man killed his mother at their home and then opened fire Friday inside the elementary school where she taught, massacring 26 people, including 20 children, as youngsters cowered in fear to the sound of gunshots reverberating through the building and screams echoing over the intercom Photo: AP

Mourners gather for a vigil service for victims of the Sandy Hook Elementary School shooting, at the St. Rose of Lima Roman Catholic Church in Newtown, Conn. Friday, Dec. 14, 2012. A man killed his mother at their home and then opened fire Friday inside the elementary school where she taught, massacring 26 people, including 20 children, as youngsters cowered in fear to the sound of gunshots reverberating through the building and screams echoing over the intercom Photo: AP

Mourners gather outside a vigil service for victims of the Sandy Hook Elementary School shooting, at the St. Rose of Lima Roman Catholic Church in Newtown, Conn. Friday, Dec. 14, 2012. A man killed his mother at their home and then opened fire Friday inside the elementary school where she taught, massacring 26 people, including 20 children, as youngsters cowered in fear to the sound of gunshots reverberating through the building and screams echoing over the intercom Photo: AP

Connecticut Gov. Dannel Malloy, left, speaks to mourners at a vigil service for victims of the Sandy Hook Elementary School shooting, at the St. Rose of Lima Roman Catholic Church in Newtown, Conn. Friday, Dec. 14, 2012. A man killed his mother at their home and then opened fire Friday inside the elementary school where she taught, massacring 26 people, including 20 children, as youngsters cowered in fear to the sound of gunshots reverberating through the building and screams echoing over the intercom Photo: AP

A family prays at a statue of the Virgin Mary outside Saint Rose of Lima church, Friday, Dec. 14, 2012 in Newtown, Conn. A man killed his mother at home and then opened fire Friday inside the elementary school where she taught, massacring 26 people, including 20 children, as youngsters cowered in fear to the sound of gunshots echoing through the building and screams coming over the intercom. (AP Photo/The Journal News, Frank Becerra Jr.) NYC OUT, NO SALES, ONLINE OUT, TV OUT, NEWSDAY INTERNET OUT; MAGS OUT Photo: AP

Connecticut Gov. Dannel Malloy speaks to mourners at a vigil service for victims of the Sandy Hook Elementary School shooting, at the St. Rose of Lima Roman Catholic Church in Newtown, Conn. Friday, Dec. 14, 2012. A man killed his mother at their home and then opened fire Friday inside the elementary school where she taught, massacring 26 people, including 20 children, as youngsters cowered in fear to the sound of gunshots reverberating through the building and screams echoing over the intercom Photo: AP

Connecticut Gov. Dannel Malloy bows his head during a moment of silence during a vigil service for victims of the Sandy Hook Elementary School shooting, at the St. Rose of Lima Roman Catholic Church in Newtown, Conn. Friday, Dec. 14, 2012. Photo: AP

Thousands of people attend vigil at Saint Rose of Lima church at Saint Rose of Lima church, Friday, Dec. 14, 2012 in Newtown, Conn. A man killed his mother at home and then opened fire Friday inside the elementary school where she taught, massacring 26 people, including 20 children, as youngsters cowered in fear to the sound of gunshots echoing through the building and screams coming over the intercom. (AP Photo/The Journal News, Frank Becerra Jr.) NYC OUT, NO SALES, ONLINE OUT, TV OUT, NEWSDAY INTERNET OUT; MAGS OUT Photo: AP

A man hugs his young daughters as they attend a vigil at Saint Rose of Lima church at Saint Rose of Lima church, Friday, Dec. 14, 2012 in Newtown, Conn. A man killed his mother at home and then opened fire Friday inside the elementary school where she taught, massacring 26 people, including 20 children, as youngsters cowered in fear to the sound of gunshots echoing through the building and screams coming over the intercom. (AP Photo/The Journal News, Frank Becerra Jr.) NYC OUT, NO SALES, ONLINE OUT, TV OUT, NEWSDAY INTERNET OUT; MAGS OUT Photo: AP

A man and woman pray at a makeshift shrine at a vigil at Saint Rose of Lima church at Saint Rose of Lima church, Friday, Dec. 14, 2012 in Newtown, Conn. A man killed his mother at home and then opened fire Friday inside the elementary school where she taught, massacring 26 people, including 20 children, as youngsters cowered in fear to the sound of gunshots echoing through the building and screams coming over the intercom. (AP Photo/The Journal News, Frank Becerra Jr.) NYC OUT, NO SALES, ONLINE OUT, TV OUT, NEWSDAY INTERNET OUT; MAGS OUT Photo: AP

Thousands attend a vigil for the victims of the school shooting at Saint Rose of Lima church, Friday, Dec. 14, 2012 in Newtown, Conn. A man killed his mother at home and then opened fire Friday inside the elementary school where she taught, massacring 26 people, including 20 children, as youngsters cowered in fear to the sound of gunshots echoing through the building and screams coming over the intercom. Photo: AP

Thousands attend a vigil for the victims of the school shooting at Saint Rose of Lima church, Friday, Dec. 14, 2012 in Newtown, Conn. A man killed his mother at home and then opened fire Friday inside the elementary school where she taught, massacring 26 people, including 20 children, as youngsters cowered in fear to the sound of gunshots echoing through the building and screams coming over the intercom. Photo: AP

A mourner bows her head inside the St. Rose of Lima Roman Catholic Church at a vigil service for victims of the Sandy Hook Elementary School shooting, in Newtown, Conn. Friday, Dec. 14, 2012. Photo: AP

Mourners gather inside the St. Rose of Lima Roman Catholic Church at a vigil service for victims of the Sandy Hook Elementary School shooting that left at least 27 people dead, many of them young children, in Newtown, Conn. Friday, Dec. 14, 2012. Police have identified the gunman as Adam Lanza, whose mother was a teacher at the school. Photo: AP

Mourners gather inside the St. Rose of Lima Roman Catholic Church at a vigil service for victims of the Sandy Hook Elementary School shooting that left at least 27 people dead, many of them young children, in Newtown, Conn. Friday, Dec. 14, 2012. Police have identified the gunman as Adam Lanza, whose mother was a teacher at the school. Photo: AP

Brenda Hernadez of Enfield Conn., comforts her daughter Crystal at a makeshift shrine on the Enfield Town Green, Friday evening, December 14, 2012, after a candlelight vigil in Enfield, Conn. The vigil was organized by social media in memory of the school shooting victims in Newtown as residents in Enfield, 70 miles from Newtown, and in through out the state, feel the grief of the mass shooting at the Sandy Hook Elementary School Friday morning. (AP Photo/Journal Inquirer, Jim Michaud) MANDATORY CREDIT Photo: AP

Girls embraces outside St. Rose of Lima Roman Catholic Church, which was filled to capacity, during a healing service held in for victims of an elementary school shooting in Newtown, Conn., Friday, Dec. 14, 2012. A gunman opened fire at Sandy Hook Elementary School in Newtown, killing 26 people, including 20 children. Photo: AP

As hundreds stand outside St. Rose of Lima Roman Catholic Church, which was filled to capacity, a couple embrace during a healing service held in for victims of an elementary school shooting in Newtown, Conn., Friday, Dec. 14, 2012. A gunman opened fire at Sandy Hook Elementary School in Newtown, killing 26 people, including 20 children. Photo: AP

Men and women hold candles in vigil outside St. Rose of Lima Roman Catholic Church during a healing service held in for victims of an elementary school shooting in Newtown, Conn., Friday, Dec. 14, 2012. A gunman opened fire at Sandy Hook Elementary School in the town, killing 26 people, including 20 children. Photo: AP

Ray Ruzek hangs a sign inviting people to a prayer meeting at the Heaven Ice Cream shop, Friday, Dec. 14, 2012 in Newtown, Conn. A gunman walked into the school Friday and opened fire, killing 26 people, including 20 children. Photo: AP

Ray Ruzek, left, consoles Shirley Towne as she speaks of the events of the day before a prayer meeting at the Heaven Ice Cream shop, Friday, Dec. 14, 2012 in Newtown, Conn. A gunman walked into the school Friday and opened fire, killing 26 people, including 20 children. Photo: AP

Signs of support are showing up all over the Sandy Hook area of Newtown, Conn. on Saturday, Dec. 15, 2012, a day after a mass shooting at Sandy Hook Elementary School. The shooter, Adam Lanza also died on the scene. Photo: Carol Kaliff

Scene outside Sandy Hook Elementary School in Newtown, Conn. on Saturday morning Dec. 15, 2012, where 20 children and six adults were killed by a lone 20-year-old gunman yesterday. Photo: Will Waldron, Hearst Connecticut Newspapers/Wi

Media gather at Treadwell Park in Newtown, Conn. for a press briefing by State Police Lt. Paul Vance on Saturday, Dec. 15, 2012. Photo: Michael Duffy

Media gather at Treadwell Park in Newtown, Conn. for a press briefing by State Police Lt. Paul Vance on Saturday, Dec. 15, 2012. Photo: Michael Duffy

Connecticut State Police Lt Paul Vance leads a press conference at Treadwell Park in Newtown, Conn. on Saturday Dec. 15, 2012. Photo: Michael Duffy

Six-year-old Noah Pozner was one of the victims in the Sandy Hook Elementary School shooting in Newtown, Conn. on Dec. 14, 2012. Photo: Uncredited, Photo Provided By The Family Vi

Jesse Lewis, 6-year-old victim of the Sandy Hook Elementary School shooting in Newtown, Conn. on Friday, Dec. 14, 2012. Photo: Contributed Photo

Emilie Alice Parker was killed Friday, Dec. 14, 2012, when a gunman opened fire at Sandy Hook Elementary School in Newtown, Conn. Photo: Contributed Photo, (AP Photo/Courtesy Of The Parker

Mourners react after placeing flowers on a memorial built around the sign for the Sandy Hook School in Newtown Saturday, Dec. 15, 2012. Sandy Hook Elementary School was the site of a mass shooting on Friday. Photo: Michael Duffy, The News-Times

Members of the Sandy Hook Volunteer Fire Department decorate Christmas trees along Dickenson Drive leading to the Sandy Hook Elementary School in Newtown Saturday, Dec. 15, 2012. The school was the site of a mass shooting on Friday. Photo: Michael Duffy

Members of the Sandy Hook Volunteer Fire Department decorate Christmas trees along Dickenson Drive leading to the Sandy Hook Elementary School in Newtown Saturday, Dec. 15, 2012. The school was the site of a mass shooting on Friday. Photo: Michael Duffy

Members of the Sandy Hook Volunteer Fire Department place Christmas trees along Dickenson Drive leading to the Sandy Hook Elementary School in Newtown Saturday, Dec. 15, 2012. The school was the site of a mass shooting on Friday. Photo: Michael Duffy

Members of the Sandy Hook Volunteer Fire Department decorate Christmas trees along Dickenson Drive leading to the Sandy Hook Elementary School in Newtown Saturday, Dec. 15, 2012. The school was the site of a mass shooting on Friday. Photo: Michael Duffy

Mourners react after placeing flowers on a memorial built around the sign for the Sandy Hook School in Newtown Saturday, Dec. 15, 2012. Sandy Hook Elementary School was the site of a mass shooting on Friday. Photo: Michael Duffy

Mourners place flowers on a memorial built around the sign for the Sandy Hook School in Newtown Saturday, Dec. 15, 2012. Sandy Hook Elementary School was the site of a mass shooting on Friday. Photo: Michael Duffy

Mourners place flowers on a memorial built around the sign for the Sandy Hook School in Newtown Saturday, Dec. 15, 2012. Sandy Hook Elementary School was the site of a mass shooting on Friday. Photo: Michael Duffy

Mourners place flowers on a memorial built around the sign for the Sandy Hook School in Newtown Saturday, Dec. 15, 2012. Sandy Hook Elementary School was the site of a mass shooting on Friday. Photo: Michael Duffy

This is the scene at Treadwell Park in Newtown at a press conference about the mass shooting at Sandy Hook Elementary School Saturday, Dec. 15, 2012. Photo: Michael Duffy

Signs in front of a house near the site of the mass shooting at Sandy Hook Elementary School express neighborhood feelings in Newtown Saturday Dec. 15, 2012. Photo: Michael Duffy

State Police spokesman J. Paul Vance speaks at a press conference about the mass shooting at Sandy Hook Elementary School Saturday, Dec. 15, 2012 in Newtown. Photo: Michael Duffy

State Police spokesman J. Paul Vance speaks at a press conference about the mass shooting at Sandy Hook Elementary School Saturday, Dec.15, 2012 in Newtown. Photo: Michael Duffy

Newtown Schools Superintendent Janet Robinson addresses the press near the entrance to the Sandy Hook Elementary School in the Sandy Hook section of Newtown, Saturday, Dec. 15, 2012. Photo: Carol Kaliff

Flowers and stuffed animals are left at a police barrier blocking the way to the Sandy Hook Elementary school in the Sandy Hook section of Newtown, Conn. Saturday, where a gunman opened fire killing 28 people including himself, Friday, Dec. 15, 2012. Photo: Carol Kaliff

Mourners approach a make-shift memorial at the foot of a sign for the Sandy Hook Elementary School in Newtown, Ct., Saturday afternoon, Dec. 15, 2012. Photo: Carol Kaliff

Newtown Schools Superintendent Janet Robinson walks away after addressing the press near the entrance to the Sandy Hook Elementary School in the Sandy Hook section of Newtown, Saturday, Dec. 15, 2012. Photo: Carol Kaliff

Mourners leave flowers, balloons and notes around the sign for the Sandy Hook Elementary School in Newtown Saturday, Dec. 15, 2012. The day before, a gunman opened fire killing 28 people including himself and 20 children at the school. Photo: Carol Kaliff

Mourners left flowers, balloons and notes around the sign for the Sandy Hook Elementary School in Newtown Saturday, Dec. 15, 2012. The day before, a gunman opened fire killing 28 people including himself and 20 children at the school. Photo: Carol Kaliff

U.S. Senator Richard Blumenthal visited the firehouse in Sandy Hook Saturday, Dec. 15, 2012. 28 people including 20 children were killed when a gunman opened fire at the Sandy Hook Elementary School in Newtown, Conn. Friday. Photo: Carol Kaliff

Christmas trees are carried from a near-by firehouse, placed and then decorated along the road leading to the Sandy Hook Elementary School in Newtown, Conn. Saturday, Dec. 15, 2012. Photo: Carol Kaliff

Husband of late Jacintha Saldanha, Benedict Barboza, center, reacts as he and his son Junal, 16, left and daughter Lisha, 14, speak to the media outside the Westminster Cathedral in London after a memorial service for nurse Jacintha Saldanha who took her own life after answering a hoax phone call at King Edward VII hospital where she worked, Saturday, Dec. 15, 2012. Australian radio hosts managed to impersonate Queen Elizabeth II and Prince Charles and received confidential information about the Duchess of Cambridge's medical condition, in a hoax phone call to the hospital where the pregnant Duchess was staying and which was broadcast on-air. The controversial prank took a dark twist three days later with the death of Saldanha, a 46-year-old mother of two, who was duped by the DJs despite their Australian accents. Photo: Sang Tan, Associated Press

There are homemade signs around Newtown Sunday, Dec. 16, 2012. Photo: Michael Duffy

There are memorials outside Edmond Town Hall in Newtown Sunday, Dec. 16, 2012. Photo: Michael Duffy

J.J. Watt of the Houston Texans displays a glove to remember the victims of the massacre at Sandy Hook Elementary School in Newtown, Connecticut prior to the start of the game against the Indianapolis Colts at at Reliant Stadium on December 16, 2012 in Houston, Texas. Photo: Scott Halleran, .

A Newtown, Conn., resident, who declined to give her name, sits at an intersection holding a sign for passing motorists up the road from the Sandy Hook Elementary School, Saturday, Dec. 15, 2012, in Newtown, Conn. The massacre of 26 children and adults at Sandy Hook Elementary school elicited horror and soul-searching around the world even as it raised more basic questions about why the gunman, 20-year-old Adam Lanza, would have been driven to such a crime and how he chose his victims. (AP Photo/David Goldman) Photo: David Goldman

Lois Barber reflects on FridayâÄôs tragic shooting at Shady Hook Elementary School in Newtown, Conn. Adam Lanza, age 20, was identified by authorities as the killer who fatally shot his mother in her home before gunning down 20 children and 6 adults at the school yesterday.

Photo: Will Waldron, Hearst Connecticut Newspapers/Wi

Police halted access to the Lanza home on Yogananda Street in Newtown Conn. Saturday Dec. 15, 2012. Adam Lanza, age 20, was identified by authorities as the killer who fatally shot his mother in her home before gunning down 20 children and 6 adults at Sandy Hook Elementary School in Newtown Conn. yesterday.

Photo: Will Waldron, Hearst Connecticut Newspapers/Wi

Police halted access to the Lanza home on Yogananda Street in Newtown Conn. Saturday Dec. 15, 2012. Adam Lanza, age 20, was identified by authorities as the killer who fatally shot his mother in her home before gunning down 20 children and 6 adults at Sandy Hook Elementary School in Newtown Conn. yesterday.

Photo: Will Waldron, Hearst Connecticut Newspapers/Wi

An undated photo of Nancy Lanza was provided by a family member. (Courtesy Family of Nancy Lanza)

Photo: Courtesy Family Of Nancy Lanza

Adam Lanza, photographed in his sophomore yearbook as a member of the tech club in the 2008 Newtown High School yearbook.

Photo: Maggie Gordon, Hearst Connecticut Newspapers/Ma

Assesor's database photo of 36 Yogananda St. in Newtown, Conn., reporter home of Nancy Lanza, the mother of Adam Lanza.

Photo: Contributed Photo