Westport police are working with New Haven authorities to sort out details of a family business dispute that left two brothers dead Monday morning, one in New Haven and one by his own hand in Westport.

Authorities said Daniel Shwisha of Woodbridge shot and killed Gordon Shwisha of Fairfield outside the family's business in New Haven, then drove to their parents home in the Greens Farms section where he shot himself.

Police are investigating the incident as a murder suicide, Westport Police said.

Gordon Shwisha, 45, was shot multiple times as he sat in his car outside Electrix Inc., the family's lighting-fixtures business in New Haven, New Haven police said. He was pronounced dead at the scene.

Daniel Shwisha, 47, then drove to their parents home on Rustic Lane, where police there said he shot himself in the head about 45 minutes later.

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

The company manufacturers 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, is listed as company president.

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 drove to their parents home off Greens Farms Road and shot himself in the head at about 8:30 a.m.

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

WTNH reported police had been called to Electrix last month when employees found ammunition there.

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

The family business is a manufacturer of architectural lighting fixtures founded in 1962, according to its website.

Among its clients, Electrix lists Lincoln Center, the New York Times and IBM in New York City and Diageo plc, the Norwalk distributor of spirits, beer and wine.