Joseph Spencer was 21 and a resident of Richmond when he was shot and killed in Antioch, California, on May 25, 2016. The shooting happened around 10:35 a.m. near Crater Peak Way and Black Diamond Drive; officers who responded found Spencer with fatal gunshot wounds and he was pronounced dead at the scene.

Antioch police investigators described the shooting as a targeted act of violence. By the end of the same day four people had been arrested — two men and two boys — as detectives continued interviewing witnesses and collecting evidence. The suspects were booked on charges related to Spencer’s murder as the legal process began.

If anyone saw activity around Crater Peak Way and Black Diamond Drive that morning or has information that wasn’t already shared with Antioch police, please report it to the department.