Edgar Sanchez Rios was 15 when he was killed in a shooting at Libby Lake Park in Oceanside, California, on March 13, 2013. The shooting happened about 9 p.m. near a makeshift memorial for two teens killed in the park two years earlier. Edgar and 13-year-old Melanie Virgen were sitting on a couch placed near the memorial when someone opened fire; both were killed and two other teenagers were seriously wounded.

Authorities described the attack as gang-related retaliation and investigators arrested four young men in connection with the case: Martin Melendrez, Santo Diaz, Michael Zurita, and Kevin Brizuela. Martin Melendrez pleaded guilty to second-degree murder and attempted murder and received a sentence of 40 years to life. Santo Diaz pleaded guilty to voluntary manslaughter after being acquitted of first-degree murder and was sentenced to 39 years. Both men expressed remorse at sentencing.

Anyone who knew Edgar, Melanie, or the group that night, or who has information about the shooting, is invited to share what they know.