William Marshall Sisco Jr. Missing from Pima County, Arizona age 32

Case Description

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William Marshall Sisco Jr., a 32-year-old man, went missing from Pima County, Arizona on June 12, 1994. At the time of his disappearance, he was in the Happy Valley area with two friends, panning for gold. An argument reportedly broke out between Sisco and his friends that evening because Sisco wanted to leave, and his friends did not. Consequently, Sisco departed the area alone and on foot, and has not been seen or heard from since.

At the time he went missing, Sisco was described as a ...Read More
Last Seen: Jun 12, 1994

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Pima County Sheriff's Department

Victim Details

Created

Jan 24, 2026

Case Added

Jan 24, 2026

Firstname

William

Lastname

Marshall Sisco Jr.

Current Age

32

Age At Disappearance

32

Height

6'1 inches

Weight

165 lbs

Ethnicity

White

Gender

Male

Notes

Sisco was last seen panning for gold with two friends in the Happy Valley area of Pima County, Arizona on June 12, 1994. That evening he got into an argument with his friends; he wanted to leave and his friends did not. Sisco left on foot and alone. He has never been heard from again. Sisco had two warrants out for his arrest when he disappeared; one of his friends believes he left of his own accord to avoid having to go to prison. Investigators, however, believe Sisco may have met with foul play or died of exposure in the desert. He left a young daughter behind when he vanished. His case remains unsolved.

Last Seen

Jun 12, 1994

City

Pima County

State

Arizona

Zip Code

Pima County

Vehicles

6

Agency Name

Pima County Sheriff's Departmen

Agency Phone

520-741-4900

Last Updated

01/24/2026

William Marshall Sisco Jr.
Missing

Case Description

Links to Additional Sources (1)

Victim Details

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