"The person or persons that did this is not in custody, so there is somebody that is out there that has a firearm that apparently is not afraid to use it," said Alameda County Sheriff's Sgt. J.D. Nelson.
People reported hearing shots at around 5:45 p.m. on Garden Avenue and "A" Street near Hayward.
When deputies arrived, they found a 24-year-old man, lying dead on the shoulder of the road. He had been shot several times.
Detectives are interviewing people to try and find out what happened and what may have prompted this deadly shooting.