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Crime Solvers Central
302 Cases Solved. Advancing justice for missing persons, unsolved homicides, unidentified and unclaimed remains.

Case Description

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Summary based on the NamUs case record (MP31123) and 5 other sources
Gordon Mason, a 57-year-old man from San Francisco, California, was last seen at his home on December 13, 1980. He has not been heard from since that day, and his disappearance remains a mystery. Mason was described as 5'10", weighing about 160 pounds, with gray hair and brown eyes. At the time of his disappearance, he was wearing tan slacks, a light-colored shirt, and a tan raincoat.

Very few details have emerged over the years regarding his case, and no evidence has been found to indicate what may have happened to him. Authorities have dental records on file, but no other significant clues have surfaced. The case remains classified as an endangered missing person, and investigators continue to seek information about his whereabouts. The San Francisco Police Department is leading the investigation.

Mason's case remains one of many unsolved disappearances from the area, with no clear suspects or leads as of now. Anyone with information is encouraged to contact law enforcement.

Last Seen: Dec 13, 1980

Possible Unidentified Matches (10)

Unidentified remains cases whose details are consistent with this person, ranked by how closely they compare. Fields that are unknown in either case are left out of the score.

84%Moderate
John Doe — San Francisco, California
UP5913 • Found Feb 13, 1986
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Sex ✓Male
Age 100%Est. 60–70 vs 57 when missing
Race 100%White
Location 100%5 mi away, same county
TimingFound 5 years after last seen
Height 100%5'9" vs 5'10"
Weight 100%175 lb vs 160 lb
Hair 100%Gray vs Gray
83%Moderate
John Doe — San Francisco, California
UP5899 • Found Dec 24, 1983
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Sex ✓Male
Age 85%Est. 55–75 vs 57 when missing
Race 100%White
Location 100%5 mi away, same county
TimingFound 3 years after last seen
Height 100%5'10" vs 5'10"
Weight 100%145 lb vs 160 lb
Hair 100%Gray vs Gray
Eyes 60%Hazel vs Brown
82%Moderate
John Doe — San Francisco, California
UP5893 • Found Nov 23, 1982
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Sex ✓Male
Age 94%Est. 60–70 vs 57 when missing
Race 100%White
Location 100%5 mi away, same county
TimingFound 23 months after last seen
Height 100%5'10" vs 5'10"
Weight 70%200 lb vs 160 lb
Hair 100%Gray vs Gray
Eyes 0%Blue vs Brown
81%Moderate
John Doe — San Francisco, California
UP91361 • Found Feb 5, 2022
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Sex ✓Male
Age 100%Est. 60–70 vs 57 when missing
Race 100%White
Location 100%2 mi away, same county
TimingFound 41 years after last seen
Height 100%5'9" vs 5'10"
Weight 81%191 lb vs 160 lb
Hair 100%Gray vs Gray
Eyes 100%Brown vs Brown
81%Moderate
John Doe — San Francisco, California
UP5944 • Found Mar 30, 1996
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Sex ✓Male
Age 85%Est. 60–80 vs 57 when missing
Race 100%White
Location 100%5 mi away, same county
TimingFound 15 years after last seen
Height 100%5'11" vs 5'10"
Weight 100%155 lb vs 160 lb
Hair 100%Gray vs Gray
Eyes 100%Brown vs Brown
81%Moderate
John Doe — Brentwood, California
UP12491 • Found Sep 14, 1985
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Sex ✓Male
Age 100%Est. 50–60 vs 57 when missing
Race 100%White
Location 90%46 mi away, same state
TimingFound 5 years after last seen
Height 100%5'10" vs 5'10"
Hair 100%Gray vs Gray
81%Moderate
John Doe — San Francisco, California
UP5898 • Found Dec 18, 1983
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Sex ✓Male
Age 85%Est. 50–75 vs 57 when missing
Race 100%White
Location 100%5 mi away, same county
TimingFound 3 years after last seen
Height 100%5'10" vs 5'10"
Weight 100%165 lb vs 160 lb
Hair 100%Gray vs Gray
Eyes 0%Blue vs Brown
80%Moderate
John Doe — San Francisco, California - unidentified case UP146037
John Doe — San Francisco, California
UP146037 • Found Oct 10, 2014
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Sex ✓Male
Age 100%Est. 48–62 vs 57 when missing
Race 100%White
Location 100%3 mi away, same county
TimingFound 34 years after last seen
Height 100%5'5"–5'9" vs 5'10"
Weight 79%127 lb vs 160 lb
Hair 100%Gray vs Gray
79%Possible
John Doe — San Jose, California
UP126945 • Found Nov 23, 1992
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Sex ✓Male
Age 85%Est. 50–70 vs 57 when missing
Race 100%White
Location 91%45 mi away, same state
TimingFound 12 years after last seen
Height 84%5'8" vs 5'10"
Weight 100%175 lb vs 160 lb
Hair 100%Gray vs Gray
Eyes 100%Brown vs Brown
79%Possible
John Doe — San Francisco, California
UP5960 • Found Dec 25, 2004
View case
Sex ✓Male
Age 85%Est. 60–85 vs 57 when missing
Race 100%White
Location 100%6 mi away, same county
TimingFound 24 years after last seen
Height 100%5'10" vs 5'10"
Weight 83%190 lb vs 160 lb
Hair 70%Brown vs Gray
Eyes 100%Brown vs Brown

These comparisons are generated automatically from public NamUs case data and are not confirmed identifications. Only DNA, dental or fingerprint comparison by investigators can confirm an identity. If you believe two cases are connected, contact the agency handling the unidentified case.

Unidentified photos are blurred because many are post-mortem. Tap a photo to reveal it.