Democrat Sheila Marmion was unanimously approved Thursday to fill the vacancy on the Board of Selectmen caused by the recent resignation of Cristin McCarthy Vahey.

Vahey, also a Democrat, resigned effective Wednesday to serve as state representative for the 133rd General Assembly District, a seat she won in last November's election.

"These are really big shoes to fill," Marmion said, before taking the oath of office from Town Clerk Betsy Browne. "I'm looking forward to working with you both." The unexpired term runs through the municipal election this November.

Marmion is the director of rehabilitation for Aetna Health Care, Beacon Brook Rehabilitation Outpatient Center, in Naugatuck. She has a bachelor of science degree in political science and a master's degree in public health and occupational therapy.

Selectman Kevin Kiley, a Republican, thanked Marmion, who had been serving on the Representative Town Meeting, for volunteering to serve on the three-person Board of Selectmen. "She's proven herself to be a community leader."

First Selectman Michael Tetreau said he's had the opportunity to work with Marmion through the RTM, where he said she provided "an even-handed balance."

And Vahey was on hand to see her successor sworn in. "Those who follow the RTM probably know Sheila. If you don't, you'll be fortunate to get to know her."

Marmion was unanimously endorsed by the Democratic Town Committee to fill the seat, but under the charter, it was up to the two other members of the board to to chose a replacement.