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 (MP2648) and 8 other sources
Diana Lynn Harris, a 27-year-old woman, was last heard from on July 15, 1981, when she made a phone call to her mother from her home on No Name Key, Florida. She had recently moved to the Florida Keys after losing her job in Michigan and was working two jobs at the time of her disappearance. Diana had sent her children to Michigan earlier that summer to visit their father and was supposed to pick them up in August for a family wedding, but she never arrived.

At the time of her disappearance, Harris was living with Gary Vincent Argenzio, in a house known for drug activity. Suspicion quickly fell on Argenzio after Diana went missing. Witnesses later claimed Argenzio had confessed to harming Harris during an argument, and an informant reported seeing signs of violence in their home. Argenzio himself fled to Mexico shortly after Diana disappeared, though he was later extradited to Florida and convicted of unrelated theft charges. Despite these suspicions, no one was ever charged in connection to Diana's disappearance, and her case remains unsolved.

Diana's family has continued to seek answers, with authorities considering foul play likely. Her case remains an enduring mystery in the Florida Keys.

Last Seen: Jul 15, 1981

Possible Unidentified Matches (2)

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.

77%Possible
Jane Doe — Florida
UP1199 • Found Aug 23, 1988
View case
Sex ✓Female
Age 100%Est. 21–35 vs 27 when missing
Race 100%White
Location 76%95 mi away, same state
TimingFound 7 years after last seen
Height 100%5'6" vs 5'6"
Weight 100%140 lb vs 120–140 lb
Hair 50%Brown vs Blond
76%Possible
Jane Doe — Miami Beach, Florida
UP1143 • Found Mar 23, 1993
View case
Sex ✓Female
Age 100%Est. 33–45 vs 27 when missing
Race 100%White
Location 74%106 mi away, same state
TimingFound 12 years after last seen
Height 84%5'4" vs 5'6"
Weight 100%123 lb vs 120–140 lb
Hair 100%Blond vs Blond

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.