The driver of a car involved in an apparent street race Wednesday in Hercules that left a San Francisco sheriff’s deputy dead has come forward to police and is cooperating, a police spokeswoman said.

Hercules police spokeswoman Michelle Harrington, said the man, whom police are not identifying publicly, spoke with investigators this morning and has not been arrested.

San Francisco sheriff’s Deputy Christopher Walker, 23, was killed after the red Chevrolet Camaro he was driving slammed into a light pole on Palm Avenue, between Sycamore Avenue and the state Highway 4 on-ramp, at about 2:30 p.m.

Walker, who was alone in the Camaro, was pronounced dead at the scene. A witness reported seeing the Camaro and a silver car speeding down the road, according to Harrington. The second driver’s car, which left the scene of the crash, was described to police as a possibly a Nissan Sentra, but Harrington Friday said the car actually turned out to be a BMW.

"It does appear that both vehicles were involved in inappropriate behavior,” she said earlier.

Walker, of Antioch, had worked at the sheriff’s department for two years, most recently providing security at San Francisco General Hospital, according to spokeswoman Eileen Hirst. Before that, he worked at the San Francisco County Jail.

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