William Marshall Sisco Jr. Missing Person Case

Jan 24, 2026

Jan 24, 2026

William

Marshall Sisco Jr.

64

32

6'1 inches

165 lbs

White

Male

In the vast and often unforgiving landscape of Pima County, Arizona, the story of William Marshall Sisco Jr., a 32-year-old man, unfolds with a sense of unresolved mystery. On June 12, 1994, a day that began with the promise of fortune, William, known to his friends as Bill, was in the Happy Valley area with two companions, engrossed in the age-old pursuit of panning for gold. As evening descended, a disagreement erupted between William and his friends. He wanted to leave, but they did not share his sentiment. In a decision that would mark the last time he was ever seen, William set off alone on foot into the wilderness, leaving behind his friends and the hope of striking it rich. William was a white male with blond hair and hazel eyes, standing at 6'1" and weighing around 165 pounds. A tattoo adorned his upper right arm, a silent marker of his identity. In the wake of his disappearance, a troubling detail emerged: William had two outstanding warrants for his arrest. This fact led one of his friends to speculate that he might have chosen to vanish, to escape the legal troubles that awaited him. However, law enforcement officials harbored a more grim perspective, considering the possibilities of foul play or that he may have succumbed to the harsh realities of the desert environment. The passage of time has done little to unravel the enigma of William's disappearance. He left behind a young daughter, a life interrupted, and a case that remains unsolved. The Pima County Sheriff's Department continues to hold the case file, a testament to a life that seemingly vanished into thin air. The narrative of William Marshall Sisco Jr.'s case is one of conflicting theories, a man at a crossroads between a troubled past and an uncertain future. The central question remains: did he orchestrate his own disappearance to start anew, or did he meet a tragic end in the desolate beauty of the Arizona desert? The lack of any contact or evidence since that fateful day in 1994 leaves his family and investigators with only questions and the enduring pain of not knowing.

Jun 12, 1994

Pima County

Arizona

Pima County

Pima County Sheriff's Departmen

520-741-4900

08/05/2026