The person at the center of this case
Corinne June Groenenberg
Missing Person · Open
52 years waiting · since 1973
Missing Person: Corinne June Groenenberg
Justice for Corinne June Groenenberg — the trail went cold in 1973, but the truth hasn't.
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Key leads to think about
🚗
vehicle
Lead #1What color was the truck—green or blue—and what was its make and model?
🎯
suspect
Lead #2Who was the male driver of the truck, and where was he headed?
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witness
Lead #3Did the family friend who followed Corinne provide any additional details about the truck or driver?
Corinne June Groenenberg, a 16-year-old girl, disappeared on November 1, 1973, after leaving her home in Modesto, California and hitchhiking on the highway. A family friend witnessed her get into a green or blue truck driven by an unknown male and she was never seen again. Over 50 years later, the circumstances of her disappearance remain unclear, and investigators seek information about the truck driver and her final destination.
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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 reported sightings of Corinne or the truck after November 1, 1973?
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 MP4547. Missing person: Corinne June Groenenberg.
Last known contact: 1973-11-01 in Modesto, Stanislaus, CA. Circumstances: A family friend saw Groenenberg leave her home and followed her until she reached the highway and started to hitchhike.
She was last seen getting into a green or blue truck. The driver was male.
Demographics: 16 years, Female, White / Caucasian. Physical description: 5 ft 6 in, 115 lbs, hair: Brown, eyes: Blue.
Investigating agency: Modesto Police Department | 89016305.
Timeline of Events
👤
1973-11-01
Last Seen
Corinne left her home and was seen hitchhiking on the highway. A family friend witnessed her get into a green or blue truck driven by a male driver.
Key Locations
Interactive map showing important locations related to this case
Case Information
Incident:November 1, 1973
Last Updated:September 17, 2026
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Any information, no matter how small, could be crucial to solving this case.
Phone: 2095729500
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Case Information
Incident:November 1, 1973
Last Updated:September 17, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 2095729500
You can remain anonymous