Crime Solvers Central
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 (MP7109) and 4 other sources
Martin Alan Gentry, 23 years old, disappeared on July 20, 1986, from his residence in Rancho Cordova, California. On the day of his disappearance, Gentry received a phone call, changed his clothes, and left home intending to meet a woman at a local Circle K store. His plan was to purchase marijuana, but he never returned home. Six days later, his mother officially reported him missing.

Shortly after his disappearance, authorities received an anonymous tip suggesting that Gentry had been shot. Joseph Stanley, Gentry's best friend, was eventually charged with his murder. Stanley initially claimed that he had been coerced at gunpoint to lure Gentry from his home, and that he witnessed an unknown individual shoot him off Prairie City Road in Sacramento. Another witness, Christina Allen, who was Stanley’s girlfriend at the time, later alleged that Stanley had confessed to shooting Gentry.

Stanley was brought to trial twice in 1990, but both trials ended in mistrials due to the jury's inability to reach a verdict. As a result, Stanley was not prosecuted again, and Gentry’s body has never been found. Despite the unresolved legal proceedings, Gentry's case remains an unsolved mystery. Investigators continue to seek information that could lead to the recovery of his remains or provide closure to the case.

Last Seen: Jul 20, 1986

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.

81%Moderate
John Doe — Sacramento, California
UP12982 • Found Dec 4, 1986
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Sex ✓Male
Age 100%Est. 18–30 vs 23
Race 100%White
Location 100%9 mi away, same county
TimingFound 5 months after last seen
Height 52%5'8" vs 6'0"
Weight 100%164 lb vs 170–190 lb
Hair 60%Black vs Brown
Eyes 60%Brown vs Hazel
80%Moderate
John Doe — California - unidentified case UP2363
John Doe — California
UP2363 • Found Mar 9, 2003
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Sex ✓Male
Age 100%Est. 30–45 vs 23 when missing
Race 100%White
Location 100%9 mi away, same county
TimingFound 17 years after last seen
Height 100%5'11" vs 6'0"
Hair 100%Brown vs Brown
80%Moderate
John Doe — Sacramento, California
UP2398 • Found Aug 11, 1986
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Sex ✓Male
Age 100%Est. 18–30 vs 23
Race 100%White
Location 99%12 mi away, same county
TimingFound 3 weeks after last seen
Height 36%5'7" vs 6'0"
Weight 97%149 lb vs 170–190 lb
Hair 100%Brown vs Brown
Eyes 60%Brown vs Hazel
78%Possible
John Doe — Sausalito, California
UP7082 • Found Aug 21, 2007
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Sex ✓Male
Age 100%Est. 25–35 vs 23 when missing
Race 100%White
Location 80%82 mi away, same state
TimingFound 21 years after last seen
Height 84%5'10" vs 6'0"
Weight 100%160 lb vs 170–190 lb
Hair 100%Brown vs Brown
Eyes 100%Hazel vs Hazel
77%Possible
John Doe — Oakland, California
UP54081 • Found Dec 12, 1986
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Sex ✓Male
Age 83%Est. 25–40 vs 23
Race 100%White
Location 82%76 mi away, same state
TimingFound 5 months after last seen
Height 68%5'9" vs 6'0"
Weight 88%219 lb vs 170–190 lb
Hair 100%Brown vs Brown
Eyes 60%Brown vs Hazel
77%Possible
John Doe — San Francisco, California
UP5935 • Found Jan 18, 1993
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Sex ✓Male
Age 95%Est. 30–45 vs 23 when missing
Race 100%White
Location 80%83 mi away, same state
TimingFound 6 years after last seen
Height 84%5'10" vs 6'0"
Weight 100%165 lb vs 170–190 lb
Hair 60%Black vs Brown
Eyes 60%Brown vs Hazel
76%Possible
John Doe — California - unidentified case UP17689
John Doe — California
UP17689 • Found May 10, 1998
View case
Sex ✓Male
Age 100%Est. 20–30 vs 23 when missing
Race 100%White
Location 79%87 mi away, same state
TimingFound 12 years after last seen
Height 68%5'9" vs 6'0"
Weight 100%170 lb vs 170–190 lb
Hair 100%Brown vs Brown
Eyes 60%Brown vs Hazel
76%Possible
John Doe — Antioch, California - unidentified case UP10735
John Doe — Antioch, California
UP10735 • Found Oct 15, 2005
View case
Sex ✓Male
Age 82%Est. 45–65 vs 23 when missing
Race 100%White
Location 89%49 mi away, same state
TimingFound 19 years after last seen
Height 100%6'1" vs 6'0"
Weight 88%141 lb vs 170–190 lb
Hair 100%Brown vs Brown
76%Possible
John Doe — San Francisco, California
UP5927 • Found Oct 2, 1989
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Sex ✓Male
Age 67%Est. 30–50 vs 23 when missing
Race 100%White
Location 80%83 mi away, same state
TimingFound 3 years after last seen
Height 100%6'0" vs 6'0"
Weight 100%205 lb vs 170–190 lb
Hair 100%Brown vs Brown
75%Possible
John Doe — Milpitas, California - unidentified case UP59937
John Doe — Milpitas, California
UP59937 • Found Sep 29, 2018
View case
Sex ✓Male
Age 100%Est. 55–70 vs 23 when missing
Race 100%White
Location 79%87 mi away, same state
TimingFound 32 years after last seen
Height 100%5'11" vs 6'0"
Weight 54%115 lb vs 170–190 lb
Hair 70%Gray vs Brown
Eyes 100%Hazel vs Hazel

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.