Police in two communities are trying to piece together details of a family-business dispute that left a Fairfield man and his brother dead in what is being investigated as a murder suicide.

Gordon Shwisha, of Birch Road in Fairfield, was shot and killed Monday morning as he sat in his car outside the family's lighting-fixtures business in New Haven.

The shooter, his older brother, Daniel Shwisha, of Woodbridge, then drove to their parents home in Westport where he fatally shot himself about 45 minutes later, authorities said.

WTNH-TV cited unnamed sources as saying the middle-aged brothers were involved in a dispute about the family business, Electrix Inc.

The company manufactures architectural lighting fixtures, and documents on file with the Secretary of the State list Gordon Shwisha as the corporate secretary and Daniel Shwisha as a director.

Their father, Haim Shwisha, of Westport, is listed as the president.

Gordon Shwisha, 45, was shot multiple times outside the company's plant, New Haven police said. He was pronounced dead at the scene.

Employees arriving there for work at about 7:45 a.m. heard gunshots and called police, who found Gordon Shwisha in his Jeep Grand Cherokee. He had sustained multiple gunshot wounds, according to Officer David Hartman, a New Haven police spokesman.

After shooting his brother, authorities said, Daniel Shwisha, 47, drove to their parents home in the Greens Farms section of Westport at shot himself in the head at about 8:30 a.m.

The parents -- Haim Shwisha and his wife, Birthe Shwisha -- called 911. Daniel Shwisha was transported to Norwalk Hospital, where he was pronounced dead, Westport police said.

Westport authorities said they had not been aware of Daniel Shwisha's involvement in the New Haven shooting when EMTs were dispatched to the house at 10 Rustic Lane there.

While Daniel Shwisha was being treated, Westport police received a call from New Haven authorities alerting them Daniel Shwisha was a suspect in the New Haven shooting and likely was headed to the Rustic Lane home.

Westport authorities had already responded to the self-inflicted shooting, police said.

Westport police detectives are working with New Haven police in an ongoing investigation.

Hartman said the case is being investigated as a murder-suicide.

The family business was founded in 1962, according to its website. Among its clients, Electrix Inc. lists Lincoln Center, the New York Times and IBM in New York City and Diageo plc, the Norwalk distributor of spirits, beer and wine.