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A driver’s attempt to apologize for cutting off another vehicle led to gunfire that left that driver and a passenger in the other car dead last week, Miami television station WSVN reported Wednesday.

Police told the station that Keith Byrne, a 41-year-old retired Marine who was driving a work truck, accidentally cut off a BMW sedan while the two vehicles were approaching a red light on Friday in the city of Davie, just west of Fort Lauderdale.

Byrne attempted to apologize to the woman who was driving the BMW when her boyfriend, 22-year-old Andre Sinclair, brandished a gun from the passenger’s seat, the station reported.

Sinclair’s 19-month-old daughter was in the back seat of the BMW at the time.

The girlfriend then tried to prevent Sinclair from getting out of the BMW, but he exited and walked – armed – toward Byrne’s truck, police said.

Both Sinclair and Byrne – who was also armed – opened fire.

Byrne died from his injuries at the scene; Sinclair later succumbed to his wounds at Broward Health Medical Center.

Police said Byrne was acting in self-defense when he shot Sinclair; he had been on the phone with a friend when the incident happened.

Byrne’s family said the father of three will be buried with full military honors at the South Florida National Cemetery.

A GoFundMe account is seeking to raise $20,000 to help out Byrne’s family.