The person at the center of this case
Thomas Riha
Missing Person · Open
57 years waiting · since 1969
Missing Person: Thomas Riha
Justice for Thomas Riha — the trail went cold in 1969, but the truth hasn't.
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Key leads to think about
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suspect
Lead #1Who was the person of interest whose home contained Riha's passport and personal effects, and what was their relationship to Riha?
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evidence
Lead #2What circumstances led to the discovery of Riha's passport and personal effects in the suspect's residence?
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location
Lead #3Were there other locations Riha frequented or visited on the day of his disappearance beyond the dinner party?
Thomas Riha, a 39-year-old man, disappeared on March 15, 1969, after attending a dinner party in Boulder, Colorado. His passport and personal effects were later discovered in the home of a person of interest who died by suicide in 1971. Despite decades of investigation, the circumstances surrounding his disappearance remain unclear, and his whereabouts are still unknown.
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More leads to consider
Beyond the top three above — each detail below could be the thread that pulls this case open.
👁️
witness
Lead #4What did attendees at the dinner party observe about Riha's behavior or interactions that evening?
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Even the smallest detail could be the key to solving this case.
Official wording
Source Narrative
NamUs case MP32841. Missing person: Thomas Riha.
Last known contact: 1969-03-15 in Boulder, Boulder, CO. Circumstances: Riha was last seen at a dinner party in Boulder, CO.
His passport and other personal effects were later found in the home of a person of interest who committed suicide in 1971. Demographics: 39 years, Male, White / Caucasian.
Physical description: 5 ft 10 in, 140 lbs, hair: Brown, eyes: Blue. Investigating agency: Boulder Police Department | P69-7940 | 1969-04-04.
Timeline of Events
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1969-03-15
Thomas Riha disappears
Riha was last seen at a dinner party in Boulder, CO
🕵️
1971
Person of interest dies by suicide
A person of interest in the case committed suicide; Riha's passport and personal effects were found in their home
Key Locations
Interactive map showing important locations related to this case
Case Information
Incident:March 15, 1969
Last Updated:June 29, 2026
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Phone: 3034413333
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Case Information
Incident:March 15, 1969
Last Updated:June 29, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 3034413333
You can remain anonymous