Charles Keith Beth, 41, was a vending machine salesman from Denver who traveled to Tucson for business in the summer of 1966. Known to some as C.K. Beth, he was staying at the downtown Ramada Inn. Communication stopped on August 5, 1966, and his disappearance was reported to the Tucson Police Department on August 10.

Investigators found his hotel room with most personal belongings still present, though a dark silk suit and a pair of dress shoes were missing. His car turned up locked and abandoned days later near the United States–Mexico border in Nogales, Arizona, which added an unexplained geographic element to the case. No further evidence or confirmed sightings have been reported and the circumstances of his vanishing remain unresolved.

If anyone knew Charles, saw him in Tucson in early August 1966, or has information about his car being left near Nogales, please share what is known.