Roberto Diaz, 32, was shot and killed on October 21, 2017, in the 18800 block of Elizondo Street in the South San Jose Hills area of the San Gabriel Valley. The shooting happened during a social gathering in a residential cul-de-sac. When deputies arrived, party attendees had fled; Diaz was found lying in a driveway and pronounced dead at the scene. Another victim, Arthur Samuel Romero, 51, was found on the sidewalk and also died.

Investigators report very little information about what happened that night. Homeowners heard gunfire but did not witness the shooting or events leading up to it, and the Los Angeles County Sheriff’s Homicide Bureau says the case remains unsolved with no arrests. The bureau has asked anyone with information to contact them, and Crime Stoppers can be used for anonymous tips.

Did anyone at the party or nearby that night see something that could help identify those responsible?