David Mam was 17 when he was shot and killed in Long Beach, California, on May 23, 2009. The killing occurred in an area of the city associated with gang-related violence; police believed the shooting was gang-related but did not announce a clear motive.

Authorities asked the public for help identifying possible suspects and later offered a $10,000 reward for information.

If anyone knew David, witnessed the shooting, or has information that could help, please share what you know with investigators.