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Donald Denninger Missing Person Case

Last seen in Largo, Florida on Oct 29, 1990

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Victim Details

Apr 24, 2011

Jan 12, 2024

Donald

Denninger

61

25

72 inches

180 lbs

White / Caucasian

Male

Oct 29, 1990

Largo

Florida

Pinellas County

No

21504

Pinellas County Sheriff’s Office

Largo

Florida

Pinellas County

33778

Christopher Lyons

Deputy

10750 Ulmerton Rd, Florida

County

Law Enforcement

91-90984

Pinellas County Sheriff’s Office

Black

Hazel

Hazel

Oct 3, 2026


Area Last Seen:

Case Description

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Summary based on the NamUs case record (MP10472) and 6 other sources
Donald James Denninger, a 25-year-old man from Largo, Florida, was last seen on October 29, 1990. At the time of his disappearance, he was living in a residence on 125th Avenue North with his girlfriend, who was the last person to see him. Denninger had been living a transient lifestyle and was known to be struggling with depression and suicidal thoughts at the time of his disappearance. His out-of-state family reported him missing after police attempted to locate him in relation to a pending court case and were unable to do so.

Despite investigations, no significant leads have emerged, and Denninger has not been heard from since. He was wearing a white t-shirt and blue jeans when last seen. Authorities, including the Pinellas County Sheriff's Office, continue to seek information from the public to help resolve his case, which remains unsolved after more than three decades.

Denninger's case has been classified as endangered missing, and while few details are available, it remains active. His family continues to hope for answers regarding his fate.
Last Seen: Oct 29, 1990

Links to Additional Sources (6)

See any mistakes? Let us know!
  • MISSING - Donald Denninger | Solve the Case
  • Case
  • Missing Person / NamUs #MP10472 | NamUs
  • Donald James Denninger - The Charley Project
  • Donald Denninger | International Missing Persons Wiki | Fandom
  • Missing Persons - - Pinellas County Sheriff's Office

    • 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 — Silver Springs, Florida - unidentified case UP6052
    John Doe — Silver Springs, Florida
    UP6052 • Found Dec 29, 1992
    View case
    Sex ✓Male
    Age 100%Est. 17–30 vs 25 when missing
    Race 100%White
    Location 75%101 mi away, same state
    TimingFound 2 years after last seen
    Height 100%5'11" vs 6'0"
    Weight 98%160 lb vs 180 lb
    76%Possible
    John Doe — North Port, Florida
    UP60596 • Found Jan 1, 1996
    View case
    Sex ✓Male
    Age 85%Est. 30–50 vs 25 when missing
    Race 100%White
    Location 85%65 mi away, same state
    TimingFound 5 years after last seen
    Height 100%6'1" vs 6'0"
    Hair 60%Brown vs Black
    75%Possible
    John Doe — Tampa, Florida - unidentified case UP78
    John Doe — Tampa, Florida
    UP78 • Found May 21, 2006
    View case
    Sex ✓Male
    Age 100%Est. 30–35 vs 25 when missing
    Race 100%White
    Location 98%17 mi away, same state
    TimingFound 16 years after last seen
    Height 36%5'7" vs 6'0"
    Weight 100%172 lb vs 180 lb
    Hair 70%Gray vs Black
    75%Possible
    John Doe — Orlando, Florida - unidentified case UP531
    John Doe — Orlando, Florida
    UP531 • Found Dec 15, 1998
    View case
    Sex ✓Male
    Age 100%Est. 25–40 vs 25 when missing
    Race 100%White
    Location 76%98 mi away, same state
    TimingFound 8 years after last seen
    Height 100%5'11" vs 6'0"
    75%Possible
    John Doe — Ft Myers, Florida
    UP1165 • Found Mar 5, 1991
    View case
    Sex ✓Male
    Age 100%Est. 21–35 vs 25
    Race 100%White
    Location 74%104 mi away, same state
    TimingFound 4 months after last seen
    Height 52%5'8" vs 6'0"
    Weight 70%135 lb vs 180 lb
    Hair 100%Black vs Black

    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.

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    Forum Posts (1)

    Donald James Denninger, 25, of Largo, Florida, was last seen on October 29, 1990. He was living at a... ...Read More
    10/07/2024

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