Sulpicio Rios, 19, was shot multiple times in a parking lot in the 800 block of East Travis Boulevard in Fairfield, California, on December 10, 2016. One bullet penetrated his heart; he was taken to hospital and died shortly after the shooting.

Police arrested three people on December 15, 2016: Jorge Hernandez, 18, of Fairfield; Joel Melendez, 19, of Tracy; and a 15-year-old. Authorities described the shooting as gang-related, involving members of the Sureños and Norteños. Investigators say the confrontation began earlier that evening at a 7-Eleven on Phoenix Drive and that the killing followed a series of violent encounters between the rival gangs; Rios had been wounded in a prior shooting near Santa Barbara Way about a year earlier.

Hernandez testified at trial and the prosecutions of Hernandez and Melendez included murder charges; the 15-year-old was tried separately because of his age. Did anyone who knew Sulpicio or who was in the area that night see events that could help clarify what happened?