A Florida man was shot and killed outside a McDonald’s after an unprovoked attack on a diner who was eating his meal inside a car, authorities said Tuesday.

Brandon Turner, 36, walked up to a car in the parking lot of the Port St. John fast-food restaurant around 8:30 p.m. Sunday and physically attacked the driver, the Brevard County Sheriff’s Office said.

As the driver was struck repeatedly, he grabbed a firearm in the vehicle and fired one shot, striking Turner, according to authorities. 

Turner was rushed to a local hospital, where he was pronounced dead.

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Detectives said it appeared that Turner mistook the driver for someone else before the attack.

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The driver was not arrested and his identity has not been released.

The sheriff’s office is continuing to investigate.