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 (MP87102) and 6 other sources
Mark Randall Davis, a 20-year-old Texas A&M University student, was last seen on January 15, 2007, in Tyler, Texas. He was home for winter break and had recently changed his major from chemical engineering and economics to Spanish. Mark's family became concerned when they discovered that he was gone from their home early in the morning, having left behind his wallet, cell phone, money, and a note indicating that they would never see him again. He took his father's green and silver 2005 Expedition mountain bike, which was also missing.

Prior to his disappearance, Mark had shown signs of depression and had recently visited a therapist, although the therapist did not believe his condition was severe. In the days before he went missing, Mark appeared withdrawn and uncertain about his future. He had stopped attending most of his classes, except for his Spanish course. His parents later reported that he might have been considering a move to Latin America, as he was fluent in Spanish and had traveled to Mexico before. However, he left his passport behind, and it has never been renewed.

Several unconfirmed sightings of Mark were reported in the days following his disappearance, but no solid leads have surfaced. Despite a thorough search and investigations by local authorities, Mark’s whereabouts remain unknown. His family remains hopeful for any news about his well-being, though they fear he may have taken his own life due to the contents of his note. His case remains open and unsolved.

Last Seen: Jan 14, 2007

Possible Unidentified Matches (5)

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.

79%Possible
John Doe — Balch Springs, Texas
UP4873 • Found Jan 12, 2009
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Sex ✓Male
Age 85%Est. 20–40 vs 20 when missing
Race 100%White
Location 80%81 mi away, same state
TimingFound 24 months after last seen
Height 100%5'7" vs 5'8"–5'11"
Weight 100%194 lb vs 160–185 lb
Hair 100%Brown vs Brown
78%Possible
John Doe — Farmers Branch, Texas - unidentified case UP1397
John Doe — Farmers Branch, Texas
UP1397 • Found Oct 30, 2007
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Sex ✓Male
Age 100%Est. 20–30 vs 20
Race 60%Hispanic
Location 75%101 mi away, same state
TimingFound 10 months after last seen
Height 100%5'7" vs 5'8"–5'11"
Weight 100%168 lb vs 160–185 lb
Hair 100%Brown vs Brown
Eyes 100%Brown vs Brown
77%Possible
John Doe — Dallas, Texas - unidentified case UP142199
John Doe — Dallas, Texas
UP142199 • Found Jun 23, 2024
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Sex ✓Male
Age 100%Est. 20–25 vs 20 when missing
Race 100%White
Location 76%98 mi away, same state
TimingFound 17 years after last seen
Height 100%5'7" vs 5'8"–5'11"
Weight 86%214 lb vs 160–185 lb
Hair 60%Black vs Brown
Eyes 100%Brown vs Brown
75%Possible
John Doe — Dallas, Texas
UP76467 • Found Aug 26, 2020
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Sex ✓Male
Age 80%Est. 36–48 vs 20 when missing
Race 100%White
Location 77%92 mi away, same state
TimingFound 14 years after last seen
Height 100%5'9" vs 5'8"–5'11"
Weight 100%159 lb vs 160–185 lb
Hair 100%Brown vs Brown
Eyes 60%Hazel vs Brown
75%Possible
John Doe — Texas
UP9266 • Found Aug 9, 2007
View case
Sex ✓Male
Age 100%Est. 20 vs 20
Race 100%White
Location 41%342 mi away, same state
TimingFound 7 months after last seen
Height 100%5'7" vs 5'8"–5'11"
Weight 100%153 lb vs 160–185 lb
Hair 60%Black vs Brown
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.