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Deputies responded to the area of San Pablo Avenue and O'Connor Drive at about 4:20 p.m. on reports of the shooting, sheriff's spokesman Jimmy Lee said.
Arriving deputies found the shooting victim and he was pronounced dead at the scene, according to Lee.
Lee said investigators are searching for a small, dull black Toyota pickup truck with damage to the left side of its front end in connection with the shooting.
Anyone with information on the case is asked to call the sheriff's office at (925) 646-2441.
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