The person at the center of this case
Sibylle Claus-Prange
Missing Person · Open
35 years waiting · since 1991
Missing Person: Sibylle Claus-Prange
Justice for Sibylle Claus-Prange — the trail went cold in 1991, but the truth hasn't.
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Key leads to think about
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location
Lead #1What specific trail into the Grand Canyon did they plan to hike, and was that hike ever completed or documented?
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person
Lead #2What was the full account from her husband Eberhard about their activities at the Grand Canyon and the circumstances of Sibylle's disappearance?
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timeline
Lead #3Why is there a two-day gap between the May 2 incident date and the May 4 bank transaction, and what occurred during this period?
Sibylle Claus-Prange, a 27-year-old German woman, disappeared in early May 1991 shortly after arriving in the United States and marrying her husband Eberhard at Las Vegas. The couple had traveled from Germany via New York and were last confirmed at the Grand Canyon on May 4, 1991, where they withdrew money at a local bank before planning to hike into the canyon. Despite over three decades of investigation, the circumstances of her disappearance remain unclear, and authorities continue to seek information about what happened to her during or after that canyon visit.
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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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evidence
Lead #4Were there any belongings, camping equipment, or personal items recovered from the Grand Canyon area that could indicate their presence?
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Even the smallest detail could be the key to solving this case.
Official wording
Source Narrative
NamUs case MP160303. Missing person: Sibylle Claus-Prange.
Last known contact: 1991-05-02 in Grand Canyon, Coconino, AZ. Circumstances: Sibylle and her husband Eberhard (MP160129) arrived in the US from Germany on 4/15/1991, flying to Las Vegas via New York.
According to a letter written to his parents, they spent a few days in New York, then flew on to Las Vegas and were married there on 4/25/1991. On 5/4/1991, they utilized the Valley National Bank at Grand Canyon to send money back to Germany.
The letter written to his parents indicated that they planned to go into the canyon on a trail and not leave. Demographics: 27 years, Female, White / Caucasian.
Physical description: 5 ft 5 in, 115 lbs, hair: Brown, eyes: Brown. Investigating agency: Coconino County Sheriff's Office | S2200277 | 1991-09-17.
Timeline of Events
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1991-04-15
Arrival in United States
Sibylle and husband Eberhard arrived in the US from Germany, flying to Las Vegas via New York
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1991-04-25
Marriage in Las Vegas
Sibylle and Eberhard were married in Las Vegas
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1991-05-04
Last confirmed sighting
Couple utilized Valley National Bank at Grand Canyon to send money back to Germany; planned to hike into the canyon
Key Locations
Interactive map showing important locations related to this case
Case Information
Incident:April 15, 1991
Last Updated:July 10, 2026
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Phone: 9287744523
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Case Information
Incident:April 15, 1991
Last Updated:July 10, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 9287744523
You can remain anonymous