Disappearance of Theresa Ann Bier

In 1987, a 16-year-old girl named Theresa Ann Bier went missing on a camping trip. She was last seen with 43-year-old Russell Welch in the Sierra Nevada mountain range. They were reportedly searching for the legendary creature known as Sasquatch or Bigfoot. Welch considered himself to be a "student" of the legend. Authorities questioned Welch when he returned days later. He initially claimed that Theresa ran away from him on June 1, but then changed his story stating that Theresa had been forcibly taken by Bigfoot. He managed to avoid trial due to the lack of a body.