In June 1987, 16-year-old Theresa Ann Bier vanished after going on a supposed Bigfoot-hunting trip in California’s Sierra Nevada mountains with 43-year-old Russell “Skip” Welch, a known meth user and self-proclaimed Bigfoot expert. Welch returned alone, claiming that Bigfoot had abducted her, though police suspected foul play. Theresa came from a deeply troubled and abusive background, having bounced between neglectful and violent relatives. Welch—linked to her uncle’s circle of drug users—was known for luring young girls into the wilderness under bizarre pretexts. After Theresa disappeared, Welch told increasingly erratic stories involving Bigfoot, satanic rituals, and supernatural beings, while investigators found a staged campsite and items belonging to both him and Theresa. Despite inconsistencies and evidence of deception, lack of concrete proof led to the charges being dropped. Theresa was never found, and while most believe Welch killed her, others speculate alternative culprits, including the “Speed Freak Killers.” Her case remains unsolved, and she is still missing to this day.
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