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298 Cases Solved. Advancing justice for missing persons, unsolved homicides, unidentified and unclaimed remains.

Case Description

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Summary based on the NamUs case record (MP41214) and 1 other source
On August 17, 1981, a 33-year-old man named William 'Bill' Arthur Tiedeman, along with three other men, boarded a red and white Cessna 180 in Anchorage, Alaska. Their destination was the small community of Grayling, a journey that would take them over the formidable terrain of the Rainy Pass. Tiedeman, a man with brown hair and brown eyes, was dressed in a dark blue denim jacket, blue jeans, and brown engineer-style boots. He also wore a digital watch and a distinctive necklace made with bear claws and coins. The flight, however, never reached its destination, vanishing without a trace and leaving behind a mystery that has endured for decades.

The Cessna, with the tail number N3424Y, was also carrying Kenneth Fischer, Robert Hawk, and Larry Larson. The planned route through Rainy Pass is known for its challenging and often unpredictable weather conditions, a factor that has been considered in the disappearance of other aircraft in Alaska's vast wilderness. When the plane failed to arrive in Grayling as scheduled, it was reported overdue, prompting the Alaska State Troopers to initiate a search and rescue operation. Despite what were likely extensive search efforts, no sign of the aircraft or the four men aboard was ever discovered. The complete absence of wreckage, distress signals, or any other evidence has left investigators and the families of the missing men with no clear answers as to what transpired on that fateful day.

The disappearance of William Tiedeman and his companions is a case that highlights the unforgiving nature of the Alaskan frontier. Over the years, the lack of any new leads or discoveries has meant that the case has grown cold, an unsolved file in the records of the Alaska State Troopers. For the families of William Tiedeman, Kenneth Fischer, Robert Hawk, and Larry Larson, the passage of time has not diminished the pain of their loss or the longing for resolution. The case serves as a somber reminder of the perils of aviation in remote regions and the profound and lasting impact that such an unresolved disappearance has on the loved ones left behind, who continue to hope for answers about the fate of the four men who vanished from the sky.

Last Seen: Aug 17, 1981

Links to Additional Sources (1)

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Possible Unidentified Matches (1)

Unidentified remains cases whose details are consistent with this person, ranked by how closely they compare. Fields that are unknown in either case are left out of the score.

77%Possible
John Doe — Anchorage, Alaska - unidentified case UP7280
John Doe — Anchorage, Alaska
UP7280 • Found Aug 16, 2001
View case
Sex ✓Male
Age 100%Est. 45–49 vs 33 when missing
Race 100%White
Location 100%2 mi away, same county
TimingFound 20 years after last seen
Height 84%5'10" vs 5'8"
Hair 70%Gray vs Brown

These comparisons are generated automatically from public NamUs case data and are not confirmed identifications. Only DNA, dental or fingerprint comparison by investigators can confirm an identity. If you believe two cases are connected, contact the agency handling the unidentified case.

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