William Marshall Sisco Jr., 32, was last seen June 12, 1994, in the Happy Valley area of Pima County, Arizona. He had been panning for gold with two companions; a disagreement that evening prompted him to walk off alone into the desert. He never returned and has had no contact since.

William, known as Bill, is described as a white male with blond hair and hazel eyes, about 6 feet 1 inch and 165 pounds, with a tattoo on his upper right arm. Investigators noted he had two outstanding warrants at the time. One friend suggested he might have intentionally disappeared to avoid those warrants, while law enforcement has not ruled out foul play or death from exposure in the desert.

He left behind a young daughter and no confirmed sightings or evidence have surfaced since 1994. If anyone knew William, his movements that day, or has information about the Happy Valley area that evening, please come forward.