A man who shot and killed his brother Monday, then killed himself at their parents' home in Westport had been forced out of the family's business following a dispute, investigators say.

Daniel Shwisha, of Woodbridge, shot his brother, Gordon Shwisha, outside the family's lighting-fixtures business in New Haven, then drove to their parents' home in the Greens Farms section, where he fatally shot himself in the head.

Investigators said a business dispute between the siblings had been simmering, and Daniel Shwisha, 47, had been ousted from the business, according to an Associated Press report. It was unclear when Daniel Shwisha had been forced out.

Police said Gordon Shwisha, 45, was shot multiple times as he sat in his Jeep Grand Cherokee outside Electrix Inc. shortly after arriving for work at about 7:45 a.m. Monday. About 45 minutes later, Daniel Shwisha shot himself in front of his parents inside their house on Rustic Lane, authorities have said. Daniel Shwisha reportedly believed the parents had taken his brother's side in the dispute.

The brothers' father, Haim Shwisha, is listed in corporate documents as company president.

Police discovered more weapons in Daniel Shwisha's car, according to a report in the New Haven Register, including an assault rifle, a handgun and ammunition.

New Haven police on Tuesday said they had been called to Electrix several weeks earlier when employees discovered ammunition there.

Authorities said Gordon Shwisha left a wife and young child in Fairfield. His bother left a wife and young children in Woodbridge.