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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person
Lead #1Who was the person of interest whose home contained Riha's passport and effects, and what was their relationship to Riha?
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witness
Lead #2What details did attendees of the dinner party provide about Riha's demeanor and departure that evening?
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evidence
Lead #3How did Riha's passport and personal effects end up in the person of interest's home?
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 discovered in the home of a person of interest who later died by suicide in 1971. The circumstances of his disappearance remain unclear, and investigators continue to seek information about what happened that evening and the connection to the person of interest.
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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.
💡
clue
Lead #4Were there any communications or contacts between Riha and the person of interest before the disappearance?
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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
Last Seen at Dinner Party
Thomas Riha was last seen at a dinner party in Boulder, Colorado.
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1969-04-04
Case Opened
Boulder Police Department opened investigation case P69-7940.
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1971
Person of Interest Death
A person of interest in the case died by 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:October 29, 2026
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Any information, no matter how small, could be crucial to solving this case.
Phone: 3034413333
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Case Information
Incident:March 15, 1969
Last Updated:October 29, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 3034413333
You can remain anonymous