The person at the center of this case
Karen Lee Valdez-Blackburn
Missing Person · Open
42 years waiting · since 1983
Missing Person: Karen Lee Valdez-Blackburn
Justice for Karen Lee Valdez-Blackburn — the trail went cold in 1983, but the truth hasn't.
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Key leads to think about
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location
Lead #1Why was Karen traveling to Denver, and did she actually depart Cheyenne on November 20 or 21?
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vehicle
Lead #2What vehicle was Karen driving, and has it ever been located or investigated?
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witness
Lead #3Were there any witnesses who saw Karen leaving her residence or on the route to Denver?
Karen Lee Valdez-Blackburn, a 26-year-old woman, disappeared on November 20, 1983, from her residence in Cheyenne, Wyoming. She was believed to be traveling to Denver to visit a friend but never arrived at her destination. Despite decades of investigation by the Air Force Office of Special Investigations, her whereabouts remain unknown, and anyone with information about her disappearance is urged to come forward.
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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.
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contact
Lead #4Did Karen's friend in Denver confirm they were expecting her visit, and when did they realize she was missing?
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Even the smallest detail could be the key to solving this case.
Official wording
Source Narrative
NamUs case MP38394. Missing person: Karen Lee Valdez-Blackburn.
Last known contact: 1983-11-21 in Cheyenne, Laramie, WY. Circumstances: On Nov.
20, 1983 Karen was last seen at her residence in Cheyenne, WY. Karen may have been headed to Denver to visit a friend but never made it.
Demographics: 26 years, Female, White / Caucasian. Physical description: 5 ft 1 in, 115 lbs, hair: Brown, eyes: Blue.
Investigating agency: Air Force Office of Special Investigations | 33298151621616.
Timeline of Events
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1983-11-20
Last Seen at Residence
Karen was last seen at her residence in Cheyenne, Wyoming on November 20, 1983.
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1983-11-21
Reported Missing
Karen failed to arrive in Denver to visit a friend, prompting her disappearance to be reported.
Key Locations
Interactive map showing important locations related to this case
Case Information
Incident:November 20, 1983
Last Updated:June 25, 2026
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Any information, no matter how small, could be crucial to solving this case.
Phone: 8772461453
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Case Information
Incident:November 20, 1983
Last Updated:June 25, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 8772461453
You can remain anonymous