Officers responded to a call around 12:43 a.m. and found the man, a 48-year-old Discovery Bay resident, lying on the street in the 1700 block of Wilde Drive, according to sheriff's spokesman Jimmy Lee.
The man was unresponsive and suffering from gunshot wounds, according to Lee. Despite life-saving measures by the fire department and ambulance personnel, the man was later pronounced dead, Lee said.
Flowers @ Discovery Bay shooting scene, a man was killed by several suspects. Witnesses say victim may have told suspects to slow down. pic.twitter.com/SCLGhxSPJm— Cbarnard (@CornellBarnard) October 29, 2017
Sheriff's department officials said a group of men and one woman in their late teens or early 20's were driving repeatedly, through the neighborhood after midnight, causing a disturbance.
One witness said victim told the group to slow down.
Another neighbor's home security camera may have captured altercation. He said he surrendered it to police to review.
One of the cars was described as a newer model matte gray American mid-sized car, perhaps a Challenger or Mustang. The other car is a red Mitsubishi Eclipse, Lee said.
At least one witness saw the two cars involved speeding from the shooting scene.
Anyone with information is asked to contact the Contra Costa County Office of the Sheriff Investigation Division at (925) 404-4200. Tips can be emailed to tipsso.cccounty.us or called to (866) 846-3592 to leave an anonymous message.