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 (MP21203) and 4 other sources
Mark Leland Kirks, 42, was last seen on December 6, 2008, in Waco, Texas. At the time of his disappearance, Mark was living in a group home on North 43rd Street, where he had been residing for over eight years. Mark had a history of wandering off and had previously walked 40 miles to his family’s home in Whitney, Texas. His family still lived there, raising concerns that he may have tried to make his way back again.

Mark suffers from mental illness and developmental disabilities, conditions that required regular medication, which he did not have with him when he disappeared. This, combined with the cold weather and his inadequate clothing—a gray and black hooded sweatshirt, black warm-up pants, and black sneakers—led authorities to be highly concerned for his safety. Despite an extensive search of the area, no trace of him has been found.

Mark was known to be social and capable of using public transportation, but his medical condition may have left him disoriented. His case remains unsolved, and his disappearance is still classified as endangered due to his vulnerability. The Waco Police Department continues to seek any information that might help resolve his case.

Last Seen: Dec 6, 2008

Possible Unidentified Matches (8)

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 — Fort Worth, Texas - unidentified case UP8508
John Doe — Fort Worth, Texas
UP8508 • Found Oct 29, 2009
View case
Sex ✓Male
Age 99%Est. 43–57 vs 42
Race 100%White
Location 79%85 mi away, same state
TimingFound 11 months after last seen
Height 100%5'9" vs 5'8"
Weight 87%130 lb vs 160–200 lb
78%Possible
John Doe — Dallas, Texas
UP76467 • Found Aug 26, 2020
View case
Sex ✓Male
Age 100%Est. 36–48 vs 42 when missing
Race 100%White
Location 79%87 mi away, same state
TimingFound 12 years after last seen
Height 100%5'9" vs 5'8"
Weight 100%159 lb vs 160–200 lb
Hair 100%Brown vs Brown
Eyes 30%Hazel vs Blue
78%Possible
John Doe — San Marcos, Texas - unidentified case UP10560
John Doe — San Marcos, Texas
UP10560 • Found Aug 10, 2012
View case
Sex ✓Male
Age 100%Est. 45–60 vs 42 when missing
Race 100%White
Location 70%125 mi away, same state
TimingFound 4 years after last seen
Height 100%5'9" vs 5'8"
Weight 70%115 lb vs 160–200 lb
Hair 50%Blond vs Brown
Eyes 100%Blue vs Blue
78%Possible
John Doe — Balch Springs, Texas
UP4873 • Found Jan 12, 2009
View case
Sex ✓Male
Age 77%Est. 20–40 vs 42
Race 100%White
Location 79%87 mi away, same state
TimingFound 5 weeks after last seen
Height 100%5'7" vs 5'8"
Weight 100%194 lb vs 160–200 lb
Hair 100%Brown vs Brown
76%Possible
John Doe — Austin, Texas
UP11517 • Found Jun 15, 2013
View case
Sex ✓Male
Age 100%Est. 44–59 vs 42 when missing
Race 100%White
Location 75%101 mi away, same state
TimingFound 5 years after last seen
Height 100%5'7" vs 5'8"
75%Possible
John Doe — Dallas, Texas
UP17611 • Found Jan 19, 2018
View case
Sex ✓Male
Age 100%Est. 45–60 vs 42 when missing
Race 100%White
Location 79%87 mi away, same state
TimingFound 9 years after last seen
Height 100%5'7" vs 5'8"
75%Possible
John Doe — Austin, Texas - unidentified case UP9018
John Doe — Austin, Texas
UP9018 • Found Jul 30, 2011
View case
Sex ✓Male
Age 85%Est. 40–65 vs 42 when missing
Race 100%White
Location 76%95 mi away, same state
TimingFound 3 years after last seen
Height 100%5'7" vs 5'8"
Weight 100%155 lb vs 160–200 lb
Hair 40%Gray vs Brown
Eyes 0%Black vs Blue
75%Possible
John Doe — Houston, Texas - unidentified case UP7699
John Doe — Houston, Texas
UP7699 • Found Jul 17, 2010
View case
Sex ✓Male
Age 100%Est. 30–45 vs 42 when missing
Race 100%White
Location 65%148 mi away, same state
TimingFound 19 months after last seen
Height 100%5'8" vs 5'8"
Weight 87%230 lb vs 160–200 lb
Hair 60%Black vs Brown
Eyes 0%Brown 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.

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