On September 24, 2016, 28-year-old Arthur Billy Boucher was shot dead while sleeping on a living room couch at a Fullerton, California home. He was staying with friends Jennifer Goodwill-Yost and Christopher Yost, who were also killed that night. The attacker, Joshua Charles Acosta, an Army mechanic stationed at Fort Irwin, entered the house armed with a shotgun and shot Boucher in the head; Jennifer Yost was shot in the face in her bedroom and Christopher Yost was killed as he tried to flee.

Prosecutors say the killings were linked to an obsession Acosta and an accomplice, Frank Sato Felix, had with the Yosts’ 17-year-old daughter. Felix, then 25, had been in a romantic relationship with the teenager; authorities contend the two men conspired to help her leave the home until she turned 18. After the murders the trio fled to Felix’s Sun Valley residence, where they burned clothing and phones before police located the victims the next morning. Detectives arrested Felix at his home and Acosta at his military barracks.

Acosta was later convicted of three counts of first-degree murder and given life without parole. Felix was convicted in November 2024 and faces sentencing in January 2025.