Two Southern California brothers were arrested Monday on suspicion of killing 16-year-old Aranda Briones, who vanished last month after spending a night out with friends.

Owen Shover, 18, was arrested at his home in Hesperia, about 80 miles northeast of Los Angeles, and could face a murder charge, Riverside County Sheriff Chad Bianco said Tuesday. His 21-year-old brother, Gary Shover, was arrested on suspicion of conspiracy to commit murder.

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SWAT secured a search warrant for the brother’s home and dug out evidence from the backyard that led investigators to believe Briones had been murdered.

“I don’t know what was taken from their backyard, but I do know evidence was collected that confirmed (our investigators’ belief) that Miss Briones was the victim of a homicide,” Sheriff’s Lt. Chris Durham told the Press-Enterprise, a newspaper serving Southern California.

Briones was last seen alive on Jan. 13 at a park in Moreno Valley, east of Los Angeles. She had been with the younger Shover, who was described as the teen’s high school friend, according to KTLA.

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Authorities have yet to recover a body.

Her father, Landry “Chapo Lee” Briones, told the Press-Enterprise that he hoped investigators were mistaken in their belief that his daughter was dead.

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But he told the paper that if she had, indeed, been killed, then “whoever killed my daughter, they are going to have to meet their maker. When you meet God, let’s see if you can stare him in the face.”

“Whoever killed my daughter, they are going to have to meet their maker. When you meet God, let’s see if you can stare him in the face.” — Landry “Chapo Lee” Briones, father of missing teen

Police have described Briones as 5 feet, 4 inches tall with brown hair and hazel/green eyes. Anyone with information on her disappearance has been urged to contact the Moreno Valley Police Department at 951-486-6700.