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 did Karen plan to travel to Denver, and who was the friend she intended to visit?
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vehicle
Lead #2What vehicle was Karen driving, and has it ever been located?
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witness
Lead #3Were there any witnesses who saw Karen leaving Cheyenne or traveling 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 or movements that day 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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timeline
Lead #4What time did Karen leave her residence, and were there any stops or sightings between Cheyenne and Denver?
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contact
Lead #5Had Karen made contact with her intended friend in Denver before disappearing?
Have information about any of these leads?
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
Disappearance Date
Karen failed to arrive in Denver where she was planning to visit a friend, prompting concern for her safety.
Key Locations
Interactive map showing important locations related to this case
Case Information
Incident:November 20, 1983
Last Updated:September 26, 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:September 26, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 8772461453
You can remain anonymous