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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 (MP59244) and 1 other source
Gregory Thomas Arnold, 30, was last seen in Pacifica, California, on August 10, 1996. He was reported missing by his mother more than a month later on September 18, 1996. Gregory had recently been in custody at the Sonoma County Jail but was released and returned to his home in Pacifica. After his release, he left home around August 12, with plans to self-surrender to the San Mateo County Sheriff's Office on September 14. However, Gregory failed to turn himself in, and his whereabouts remain unknown.

Standing at 5'6" and weighing approximately 160 pounds, Gregory had brown hair, brown eyes, and a mustache. His case has remained unsolved for years, with limited information available regarding the circumstances of his disappearance. Despite efforts to locate him, no significant leads have emerged, and his case remains open, classified as a missing person investigation. Anyone with information is encouraged to contact the authorities, as his family continues to seek answers.
Last Seen: Aug 10, 1996

Links to Additional Sources (1)

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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 — Tiburon, California
UP7084 • Found Aug 20, 1999
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Sex ✓Male
Age 100%Est. 28–40 vs 30 when missing
Race 100%White
Location 98%19 mi away, same state
TimingFound 3 years after last seen
Height 100%5'6" vs 5'6"
Weight 83%130 lb vs 160 lb
Hair 100%Brown vs Brown
83%Moderate
John Doe — California - unidentified case UP17689
John Doe — California
UP17689 • Found May 10, 1998
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Sex ✓Male
Age 100%Est. 20–30 vs 30 when missing
Race 100%White
Location 93%36 mi away, same state
TimingFound 21 months after last seen
Height 68%5'9" vs 5'6"
Weight 100%170 lb vs 160 lb
Hair 100%Brown vs Brown
Eyes 100%Brown vs Brown
82%Moderate
John Doe — San Jose, California - unidentified case UP125517
John Doe — San Jose, California
UP125517 • Found Feb 11, 1998
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Sex ✓Male
Age 100%Est. 18–32 vs 30 when missing
Race 100%White
Location 93%37 mi away, same state
TimingFound 18 months after last seen
Height 68%5'3" vs 5'6"
Weight 76%125 lb vs 160 lb
Hair 100%Brown vs Brown
Eyes 100%Brown vs Brown
81%Moderate
John Doe — Stockton, California - unidentified case UP50599
John Doe — Stockton, California
UP50599 • Found Jul 12, 1997
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Sex ✓Male
Age 100%Est. 20–30 vs 30
Race 100%White
Location 84%69 mi away, same state
TimingFound 11 months after last seen
Height 100%5'7" vs 5'6"
Weight 89%135 lb vs 160 lb
Hair 60%Black vs Brown
80%Moderate
John Doe — Turlock, California
UP50957 • Found Jul 11, 2001
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Sex ✓Male
Age 100%Est. 30–45 vs 30 when missing
Race 100%White
Location 78%90 mi away, same state
TimingFound 5 years after last seen
Height 100%5'7" vs 5'6"
Weight 100%130–180 lb vs 160 lb
Hair 100%Brown 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 30 when missing
Race 100%White
Location 100%7 mi away, same state
TimingFound 18 years after last seen
Height 100%5'5"–5'9" vs 5'6"
Weight 79%127 lb vs 160 lb
Hair 70%Gray vs Brown
79%Possible
John Doe — Vallejo, California
UP17598 • Found Sep 2, 2003
View case
Sex ✓Male
Age 100%Est. 25–35 vs 30 when missing
Race 100%White
Location 93%36 mi away, same state
TimingFound 7 years after last seen
Height 100%5'5" vs 5'6"
Hair 40%Gray vs Brown
78%Possible
John Doe — Richmond, California - unidentified case UP12859
John Doe — Richmond, California
UP12859 • Found Dec 24, 2010
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Sex ✓Male
Age 85%Est. 40–60 vs 30 when missing
Race 100%White
Location 97%22 mi away, same state
TimingFound 14 years after last seen
Height 100%5'7" vs 5'6"
Weight 98%142 lb vs 160 lb
78%Possible
John Doe — Sausalito, California
UP7082 • Found Aug 21, 2007
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Sex ✓Male
Age 100%Est. 25–35 vs 30 when missing
Race 100%White
Location 98%17 mi away, same state
TimingFound 11 years after last seen
Height 52%5'10" vs 5'6"
Weight 100%160 lb vs 160 lb
Hair 100%Brown vs Brown
Eyes 60%Hazel vs Brown
78%Possible
John Doe — San Francisco, California - unidentified case UP146018
John Doe — San Francisco, California
UP146018 • Found Jan 18, 2014
View case
Sex ✓Male
Age 96%Est. 48–62 vs 30 when missing
Race 100%White
Location 100%10 mi away, same state
TimingFound 17 years after last seen
Height 84%5'8" vs 5'6"
Weight 88%186 lb vs 160 lb
Hair 70%Gray 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.

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