Justin Jovan Williams, 23, was shot and killed while celebrating Fourth of July fireworks at a park on Detroit’s west side on the evening of July 4, 2013. A large crowd was present when gunfire broke out; Williams was found mortally wounded and later died of his injuries.

Years of investigation have not produced an arrest or named suspects. The Detroit Police Department has revisited the case at times, and Williams’s family has repeatedly urged witnesses from that night to come forward, but the motive for the shooting remains unclear.

Anyone who was at the west-side park that night or who has information about the shooting is asked to contact investigators.