EL SOBRANTE — The Contra Costa Sheriff's Office is investigating a shooting Wednesday afternoon that left one man dead.

The fatal shooting was reported at 4:20 p.m. near the intersection of San Pablo Avenue and O'Connor Drive, Contra Costa sheriff's spokesman Jimmy Lee said.

Ricardo Colina II, 20, of Richmond, was walking when he was shot by someone in a dull black, late '80s-model Toyota pickup.

Witnesses told deputies the shooting was preceded by a fight. The shooter drove away north on San Pablo Avenue, Lee said.

Lee said his department is still unsure of the motive in the crime and has not identified any suspects. The victim's name was withheld because his family had not yet been notified.