A 33-year-old Sun Valley man has been convicted of three counts of special circumstances murder for assisting in the execution of a plot to kill the mother and stepfather of a 17-year-old girl he became obsessed with after meeting her through the “furry” subculture. According to the OCDA, a family friend sleeping on the couch was also shot and killed.

Frank Sato Felix, 33, of Sun Valley, was found guilty Tuesday of three felony counts of first-degree murder and three felony enhancements for multiple murders. He faces a maximum sentence of life in prison with no possibility of parole. He is set to be sentenced on January 17, 2025, at the Central Justice Center in Santa Ana, Department C30.

Her mother introduced the 17-year-old girl to the “furry” subculture, which involves people dressing up in animal costumes, where she met Felix, then 25, and Joshua Charles Acosta, 21, an Army mechanic stationed at Ft. Irwin in Barstow.

Felix became romantically involved with the adolescent girl, but her mother, 39-year-old Jennifer Goodwill-Yost, and stepfather, 35-year-old Christopher Yost, opposed the relationship.

Felix supplied the ammunition and shotgun used to kill the victims. On September 24, 2016, Acosta and Felix drove to the Yosts’ Fullerton home to carry out their plan to help the 17-year-old escape the house until she turned 18.

After the parents and their houseguest, family friend Arthur “Billy” Boucher, fell asleep, the 17-year-old girl entered the truck with Felix.

Acosta then shot 28-year-old Boucher in the head while he was asleep on the living room couch. Acosta then entered the master bedroom and shot the 17-year-old’s mother in the face. The girl’s stepfather attempted to flee, but was shot in the head as he tried to reach the outside patio area.

Acosta fled the house, leaving the Yosts’ six- and nine-year-old daughters alone with their parents’ and friend’s bodies, while escaping with Katlynn and Felix to Felix’s home in Sun Valley, where they burned their clothes and attempted to destroy their cell phones.

The Yosts’ six- and nine-year-old daughters awoke to find their parents dead, along with a friend, and called 911.

Fullerton Police Department detectives apprehended Felix at his Sun Valley home. Acosta was arrested in his Fort Irwin barracks.

“Two little girls, six and nine, went to sleep not knowing the last time they would see their parents would be when they woke up to find them shot to death,” said Orange County District Attorney Todd Spitzer.

“The trauma inflicted on those little girls, compounded by the violent deaths of both of their parents, is beyond heartbreaking.” Violence is never the answer, and a sick and twisted plan resulted in two young men spending their lives behind bars.”

Seton Hunt, Senior Deputy District Attorney with the Homicide Unit, is prosecuting this case.

Acosta was found guilty of special circumstances triple murder on November 8, 2018.

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