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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 (MP117429)
In the summer of 2023, a sense of concern rippled through a Dallas, Texas community when Gregory Lineaker, a man between the ages of 56 and 60, was no longer seen or heard from. His last known point of contact was on July 9, 2023, in Dallas. At the time of his disappearance, Gregory was described as a white male, standing between 5 feet 7 inches and 5 feet 8 inches tall, and weighing approximately 230 to 240 pounds. He has brown hair, though specific details about his eye color were not widely known.

The circumstances surrounding Gregory's disappearance remain unclear. Details regarding what he was last seen wearing or any potential vehicle he may have been driving have not been made publicly available. The lack of specific information created a challenging situation for those who knew him and for the authorities trying to piece together his last known movements. The days turned into weeks, and with no clear leads, the uncertainty surrounding his whereabouts grew.

The Dallas Police Department officially took on the case, with Detective Ryan Dalby assigned to the investigation. The case was entered into the National Missing and Unidentified Persons System under the number MP117429. This step ensured that Gregory's information was accessible to law enforcement agencies and medical examiners nationwide, a standard but crucial procedure in the effort to locate a missing individual. The investigation into what happened to Gregory Lineaker is a somber reminder of the many individuals who go missing each year, leaving behind unanswered questions and a community hoping for resolution.

Last Seen: Jul 9, 2023

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Possible Unidentified Matches (4)

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.

83%Moderate
John Doe — Dallas, Texas - unidentified case UP159501
John Doe — Dallas, Texas
UP159501 • Found Apr 20, 2026
View case
Sex ✓Male
Age 100%Est. 53–63 vs 56–60 when missing
Race 100%White
Location 100%9 mi away, same county
TimingFound 3 years after last seen
Height 100%5'7" vs 5'7"–5'8"
Weight 100%229 lb vs 230–240 lb
Hair 40%Gray vs Brown
81%Moderate
John Doe — Fort Worth, Texas
UP138398 • Found Nov 23, 2024
View case
Sex ✓Male
Age 100%Est. 48–62 vs 56–60 when missing
Race 100%White
Location 92%40 mi away, same state
TimingFound 17 months after last seen
Height 100%5'8"–5'9" vs 5'7"–5'8"
76%Possible
John Doe — Dallas, Texas - unidentified case UP142230
John Doe — Dallas, Texas
UP142230 • Found Sep 26, 2024
View case
Sex ✓Male
Age 100%Est. 48–62 vs 56–60 when missing
Race 60%Hispanic
Location 100%8 mi away, same county
TimingFound 15 months after last seen
Height 100%5'6" vs 5'7"–5'8"
Weight 8%119 lb vs 230–240 lb
Hair 40%Gray vs Brown
75%Possible
John Doe — Arlington, Texas
UP161734 • Found Jul 28, 2026
View case
Sex ✓Male
Age 77%Est. 68–82 vs 56–60 when missing
Race 100%White
Location 96%25 mi away, same state
TimingFound 3 years after last seen
Height 100%5'8" vs 5'7"–5'8"
Weight 0%47 lb vs 230–240 lb

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.