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Victor Lopez, a cousin of the teenager, told ABC Los Angeles station KABC-TV. that Bustos was last seen Friday when she and her best friend went to a party -- and that Bustos was last seen with a few unknown males.

On Saturday, Bustos' friend asked Lopez if the 15-year-old came home, Lopez told KABC-TV.

\"We couldn't find her and we started looking for her Saturday morning,\" Lopez said.

Bustos' family reported her missing at the Compton sheriff’s station on Sunday, according to authorities.

\"I was always overprotective over her,\" Lopez told ABC News via email Tuesday.

\"Samantha was a great kid\" and \"a great student,\" he wrote. \"Always goofy .. always a joyful person.\"

The sheriff's office said Monday night that a motive and potential suspect was unknown.

Anyone with information is urged to call the Los Angeles County Sheriff's Department's Homicide Bureau at (323) 890-5500.

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