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.
Start here
Key leads to think about
📍
location
Lead #1Why was Karen traveling to Denver and who was the friend she planned to visit?
🚗
vehicle
Lead #2What vehicle, if any, was Karen using for the trip from Cheyenne to Denver?
👁️
witness
Lead #3Were there any witnesses who saw Karen leave 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 reportedly planning to travel 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 the case remains unsolved.
Try asking
Claim this imported case
A one-time $10 claim transfers this imported case workspace to your account. You get 10 uploads for this case, 25 daily AI questions for this case, and public tips with files route to you.
10 uploads25 AI questions/day
This does not start a subscription. When the included limits are reached, the Personal plan unlocks more workspace capacity.
More leads to consider
Beyond the top three above — each detail below could be the thread that pulls this case open.
⏰
timeline
Lead #4What was the exact timeline between her last sighting on November 20 and when she was reported missing?
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
👁️
1983-11-20
Last Seen at Residence
Karen was last seen at her residence in Cheyenne, Wyoming on November 20, 1983.
👤
1983-11-21
Reported Missing
Karen failed to arrive in Denver to visit a friend, prompting concern for her disappearance.
Key Locations
Interactive map showing important locations related to this case
Case Information
Incident:November 20, 1983
Last Updated:June 18, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 8772461453
You can remain anonymous
Leave a comment
Comments
Case Information
Incident:November 20, 1983
Last Updated:June 18, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 8772461453
You can remain anonymous