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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 (MP30522) and 5 other sources
In the late summer of 1983, a young man named Mark Alden Dewitt vanished from Marietta, Georgia, leaving behind a life and a future that remain suspended in time. On Friday, September 2, 1983, the 25-year-old left a friend's apartment to run a simple errand. He was expected to return within a couple of hours, a brief absence that has now stretched into decades of unanswered questions. Mark, a man with black hair, a mustache, and brown eyes, stood at six feet tall and weighed between 170 and 180 pounds. His sudden disappearance left his loved ones in a state of perpetual uncertainty, a void that has yet to be filled with answers. The Cobb County Police Department was notified of his disappearance three days later, on September 5, 1983, initiating an investigation that continues to this day.

The initial investigation into Mark's disappearance yielded few clues. He was last seen driving a 1968 grey Mercedes Benz sedan, a vehicle that was later recovered. However, the recovery of his car did not bring investigators any closer to understanding what had happened to him. The details surrounding where and when the car was found have not been widely publicized, adding another layer of mystery to an already perplexing case. Despite the passage of time, the case remains open, a testament to the enduring hope of finding answers. In October 2015, Mark's case was entered into the National Missing and Unidentified Persons System a national database that helps to connect missing persons cases with unidentified remains. This step ensured that his information would be accessible to law enforcement agencies and medical examiners across the country, increasing the chances of a potential match.

Years have turned into decades, and still, the fate of Mark Alden Dewitt remains unknown. His case is a somber reminder of the fragility of life and the enduring pain of not knowing. For his family and friends, the passage of time has not diminished their desire for closure. The investigation, now considered a cold case, is in the hands of the Cobb County Police Department. The circumstances of his disappearance are vague, with the simple act of running an errand becoming the last known chapter of his life. The official narrative is sparse, stating only that he left his friend's apartment and was never seen again. The lack of significant leads or suspects has left the case in a state of prolonged suspension, a puzzle with too many missing pieces. The overview of the case is one of sudden and unexplained absence, a young man who seemingly vanished without a trace, leaving a void in the lives of those who knew him and a lingering question in the community he called home.

Last Seen: Sep 2, 1983

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.

82%Moderate
John Doe — Juno, Georgia
UP4699 • Found Dec 11, 1987
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Sex ✓Male
Age 100%Est. 24–29 vs 25 when missing
Race 100%White
Location 92%41 mi away, same state
TimingFound 4 years after last seen
Height 100%6'1" vs 6'0"
Weight 100%160 lb vs 170–180 lb
Hair 60%Brown vs Black
82%Moderate
John Doe — Georgia
UP152052 • Found May 7, 1988
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Sex ✓Male
Age 100%Est. 28–42 vs 25 when missing
Race 100%White
Location 96%26 mi away, same state
TimingFound 5 years after last seen
Height 100%5'10"–6'0" vs 6'0"
Weight 100%170–180 lb vs 170–180 lb
75%Possible
John Doe — Huntsville, Alabama
UP11867 • Found Dec 8, 2013
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Sex ✓Male
Age 100%Est. 28–42 vs 25 when missing
Race 100%White
Location 70%126 mi away
TimingFound 30 years after last seen
Height 100%6'0" vs 6'0"
Weight 83%212 lb vs 170–180 lb
Hair 60%Brown vs Black
Eyes 100%Brown vs Brown
75%Possible
John Doe — Birchwood, Tennessee - unidentified case UP8189
John Doe — Birchwood, Tennessee
UP8189 • Found Aug 28, 2006
View case
Sex ✓Male
Age 100%Est. 35–45 vs 25 when missing
Race 100%White
Location 75%101 mi away
TimingFound 23 years after last seen
Height 100%5'11" vs 6'0"
Weight 100%190 lb vs 170–180 lb
Hair 60%Brown vs Black
75%Possible
John Doe — Waynesville, North Carolina - unidentified case UP6291
John Doe — Waynesville, North Carolina
UP6291 • Found May 28, 2004
View case
Sex ✓Male
Age 100%Est. 25–40 vs 25 when missing
Race 100%White
Location 67%138 mi away
TimingFound 21 years after last seen
Height 100%6'1" vs 6'0"
Weight 65%123 lb vs 170–180 lb
Hair 100%Black vs Black
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.