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Homicide arrests were made Sunday in the slaying of three people at a house in Fullerton that sparked a frantic search for a missing teenage girl a day earlier.

The missing teen, Katlynn Goodwill Yost, 17, was found safe by police, who also announced the arrest of a teenager the same age on suspicion of killing Christopher Yost, 34; his wife, Jennifer Goodwill Yost, 39; and their friend, Arthur William Boucher, 28.

Katlynn Yost is the daughter of Jennifer Goodwill Yost. Police said state law prevented them from saying whether Katlynn Yost was the teenager detained at Orange County Juvenile Hall.

Police also arrested Josh Acosta, 21, of Fort Irwin, who was found in the Barstow area, and Frank Felix, 25, of Sun Valley on suspicion of murder.

Sgt. Jon Radus stressed during a news conference Sunday afternoon that the killings were not random and the victims knew their attackers.

“We hope the quick arrest of these individuals will bring comfort to the community,” Radus said, noting that police served search warrants and followed leads from south Orange County to Barstow and had everyone in custody by 8:45 a.m. Sunday.

Radus declined to release more information but said additional details would be coming today.

Mourners lit candles and left placards Sunday night at a vigil outside the Yost home in the 400 block of Gilbert Street.

Among the small crowd were friends and relatives of Boucher, who occasionally slept at the house and rode his bicycle to his job in Santa Ana as a hotel custodian.

His uncle, Salvador Mineo, said Boucher worked several odd jobs, including at Mountain High and Taco Bell.

“He was a good kid,” Mineo said. “Just the wrong place, the wrong place …,” he said, his voice trailing as he choked back tears.

Mineo said Boucher had a 3-year-old child.

Boucher’s mother, Kimberly Gracier, 48, also was at the vigil, trying to make sense of the loss.

“I’m still in shock,” Gracier said. “I don’t know what to do. … It was something stupid. He was just sleeping there.”

She said Jennifer Yost was having trouble with her daughter, who wanted to date an older man.

“It just seemed there was always something going on with the teenager,” she said.

Police were alerted to the triple homicide Saturday morning in a 911 call from a child in the home.Two girls, the 6- and 9-year-old children of Christopher and Jennifer Yost, were inside, shaken but physically unharmed. Their older sister, Katlynn, was gone.

All the bodies had obvious signs of trauma, but police did not say what caused the injuries.

Neighbors described the Yost family as loving, saying Christopher Yost often played with his daughters outside. They also said he was helpful, working on neighbors’ cars.

Jennifer Yost, on her website, thejadedraven.deviant art.com, offered glimpses into her life.

“I’m a very out spoken person I am very proud of what I believe in and speak freely about my belifes,” she wrote. “I’ve worked hard to get where I am … and I try … not to let things bring me down. I’m a carefree spirit with alot of love to give.”

She also wrote, “Yeah I have a big ego but who doesn’t these days. I can say I have come along way and feel I desever to pat myself on the back ever now and then.”

Suzanne Guerra, 37, of Waco, Texas, remembered being inseparable from Jennifer Yost as students at Buena Park High School. She especially remembered Yost dyeing Guerra’s hair purple when they were 17 and proclaiming her a Goth.

“I was this good girl with blond hair,” Guerra said in a telephone interview Sunday.

First as teenagers, then as adults, the two women closed down coffee shops every night, talking about their lives and loves.

Yost even confided in Guerra about Christopher Yost.

“He was the life of the room. He took Katlynn under his wing,” Guerra said. “Before him, I never saw Jennifer settling down. He was truly her soul mate.”