Mary Katherine Miller, 46, was last seen on June 20, 1979, in Provo, Utah, after having dinner with her daughter. She told family she planned to visit her ex-husband’s grave in American Fork that evening after learning he had died the year before, which deeply upset her. She was never heard from again.

Her brown Honda Civic was found on July 16, 1979, abandoned on a remote dirt road near the Timpooneke Trailhead on Mount Timpanogos. The car still contained her purse, keys, wallet and other personal items. Investigators interviewed nearby sheep herders; one said he saw a woman resembling Mary walking away from the vehicle, and another admitted he had considered stealing the car, but no charges were ever filed.

Mary was a registered nurse with more than 20 years of experience and is believed to have met with foul play. If anyone has information about Mary’s movements on June 20, 1979, or about the vehicle found near Timpooneke Trailhead, please come forward.