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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timeline
Lead #1Why was there a two-day gap between the last known contact on May 2 and the bank transaction on May 4? What happened during this time?
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location
Lead #2The couple stated they planned to go into the canyon on a trail and not leave—what specific trail were they planning to take and did they enter it?
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person
Lead #3What was the relationship status and condition of Eberhard (MP160129) at the time of disappearance, and what information did he provide to investigators?
Sibylle Claus-Prange, a 27-year-old German woman, disappeared in May 1991 shortly after arriving in the United States and marrying her husband Eberhard at Las Vegas. The couple had traveled from Germany through New York to Las Vegas, then to the Grand Canyon area where they were last known to be on May 2, 1991. Despite decades of investigation by the Coconino County Sheriff's Office, her fate remains unknown and any information about her whereabouts or what happened in the canyon is urgently needed.
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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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witness
Lead #4Were there any witnesses at the Grand Canyon who saw the couple during their visit in late April or early May 1991?
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clue
Lead #5The letter to Eberhard's parents mentioned their canyon plans—are there other documents or communications that could clarify their exact itinerary?
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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 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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1991-05-02
Last known contact at Grand Canyon
Last known contact date at Grand Canyon. Couple used Valley National Bank to send money to Germany on May 4, 1991
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1991-05-04
Financial transaction
Couple utilized Valley National Bank at Grand Canyon to send money back to Germany
Key Locations
Interactive map showing important locations related to this case
Case Information
Incident:April 15, 1991
Last Updated:September 26, 2026
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Phone: 9287744523
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Case Information
Incident:April 15, 1991
Last Updated:September 26, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 9287744523
You can remain anonymous