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 (MP42557) and 9 other sources
David O'Sullivan, a 25-year-old Irish national, went missing on April 7, 2017, while hiking the Pacific Crest Trail (PCT). He had been undertaking a long-distance thru-hike, starting from the Mexico-California border and aiming to reach Canada. On April 6, O'Sullivan sent an email to his family from a library in Idyllwild, California, a town in the San Jacinto Mountains. The following day, he was last seen checking out of the Idyllwild Inn, after which he intended to continue his hike northward along the PCT.

Despite extensive search efforts, O'Sullivan has not been seen or heard from since that day. His planned route could have taken him through a variety of trails in the San Jacinto Mountains, but it remains unclear which one he chose. His family and volunteers have continued to organize search efforts in the area, but his disappearance remains unsolved. O'Sullivan was described as having black hair and blue eyes, standing 5'10", and weighing 154 pounds. He had been documenting his journey and keeping in contact with his family regularly, making his sudden disappearance all the more mysterious. The search continues, with the hope that new leads may eventually surface.
Last Seen: Apr 7, 2017

Possible Unidentified Matches (6)

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.

80%Moderate
John Doe — Palm Springs, California
UP60257 • Found Mar 10, 2019
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Sex ✓Male
Age 88%Est. 20–24 vs 25 when missing
Race 100%White
Location 100%11 mi away, same county
TimingFound 23 months after last seen
Height 100%5'9"–6'1" vs 5'10"
76%Possible
John Doe — San Diego, California - unidentified case UP110585
John Doe — San Diego, California
UP110585 • Found Oct 14, 2023
View case
Sex ✓Male
Age 100%Est. 30–35 vs 25 when missing
Race 100%White
Location 83%73 mi away, same state
TimingFound 7 years after last seen
Height 100%5'11" vs 5'10"
Weight 29%215 lb vs 154 lb
Hair 100%Black vs Black
Eyes 0%Brown vs Blue
76%Possible
John Doe — Corona, California
UP68540 • Found Jan 10, 2020
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Sex ✓Male
Age 100%Est. 18–32 vs 25 when missing
Race 100%White
Location 91%44 mi away, same county
TimingFound 3 years after last seen
75%Possible
John Doe — Hermosa Beach, California
UP92868 • Found May 14, 2022
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Sex ✓Male
Age 85%Est. 21–44 vs 25 when missing
Race 100%White
Location 76%97 mi away, same state
TimingFound 5 years after last seen
Height 100%5'7"–5'10" vs 5'10"
Weight 100%150–175 lb vs 154 lb
75%Possible
John Doe — Hawthorne, California - unidentified case UP88645
John Doe — Hawthorne, California
UP88645 • Found Jan 11, 2022
View case
Sex ✓Male
Age 85%Est. 30–50 vs 25 when missing
Race 100%White
Location 77%95 mi away, same state
TimingFound 5 years after last seen
Height 100%5'5"–5'11" vs 5'10"
Weight 100%140 lb vs 154 lb
Hair 60%Brown vs Black
Eyes 0%Brown vs Blue
75%Possible
John Doe — Los Angeles, California - unidentified case UP137125
John Doe — Los Angeles, California
UP137125 • Found Nov 16, 2024
View case
Sex ✓Male
Age 79%Est. 35–45 vs 25 when missing
Race 100%White
Location 78%90 mi away, same state
TimingFound 8 years after last seen
Height 84%5'8" vs 5'10"
Weight 100%155 lb vs 154 lb
Hair 60%Brown vs Black
Eyes 100%Blue vs Blue

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.