Theresa Ann Bier: Vanished in Yosemite

On the morning of June 1, 1987, 16-year-old Theresa Ann Bier left her uncle's home in Fresno, California, dressed for school. Instead, she went on a camping trip with a 43-year-old friend of her uncle's in the Sierra Nevada Mountains to search for Bigfoot. When the man resurfaced in Fresno days later without Theresa, he said she had wandered off into the woods. He then offered an account stranger than anyone expected. Detectives found holes in his story almost immediately, but after a few attempts to comb the rugged wilderness, no trace of Theresa was ever recovered. Without a body, prosecutors could never bring him to trial. Nearly four decades later, authorities still suspect Theresa was murdered, and no one knows exactly how or why.

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