(CNN) Three people have been charged in the killing of a Los Angeles police officer who died following a shooting that happened while he was off-duty, according to the Los Angeles Police Department.

Officer Juan Diaz was one of two people who suffered gunshot wounds and were found by another police officer shortly before 1 a.m. local time Saturday, the department said in a statement posted to Twitter

Cristian Facundo and Francisco Talamantes III were each charged with one count of murder and two counts of attempted murder as well as a special circumstance allegation of murder. They are involved in a criminal street gang, according to the Los Angeles County district attorney's office.

Police say Facundo opened fire on the vehicle that Diaz was in after a brief confrontation over graffiti.

Ashlynn Smith and the two men face one count of shooting at an occupied motor vehicle and vandalism. Smith also faces one count of accessory after the fact. Talamantes was charged with one count of possession of a firearm by a felon.

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