Theresa Ann Bier was 16 when she vanished from Fresno, California, on June 1, 1987. Living with an uncle after being removed from her biological parents, she planned to skip school that day to go camping in the Sierra Nevada with 43-year-old Russell Skip Welch, who had an interest in Bigfoot. The pair were last seen about 7:20 PM near Shuteye Peak, roughly 25 miles northeast of Bass Lake.

Welch returned to Fresno without Theresa and gave changing accounts—first saying she ran away, then admitting the camping trip, then suggesting she ran into the woods. He later offered a claim that Bigfoot had abducted her. Welch had a history of drug use and allegations of inappropriate behavior toward young girls; he was charged with child stealing but the case was dropped for lack of evidence and concerns about double jeopardy. Extensive searches around Shuteye Peak turned up no trace of Theresa.

Her case remains open with the Fresno Police Department and no body or definitive evidence has been found; many believe she is likely deceased but the circumstances are unresolved. Did anyone in the Fresno or Bass Lake area know Theresa’s movements that day or see the pair near Shuteye Peak?