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Crime Solvers Central
302 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 (MP2797) and 10 other sources
In the summer of 1933, a gifted 22-year-old doctoral candidate named Joseph Laurence Halpern embarked on a road trip with his parents and a friend, Samuel Garrick. A brilliant student of astronomy and mathematics at the University of Chicago, Halpern was taking a break from his summer job at an observatory in Wisconsin. Their journey took them through the Black Hills of South Dakota and Yellowstone National Park before they arrived at their destination: Rocky Mountain National Park in Colorado, where they set up camp in Glacier Basin. On August 14th, Halpern and Garrick set out for a day hike along the Flattop Mountain Trail, leaving Halpern's parents at the campsite. After reaching the summit, Halpern expressed a desire to continue on towards Taylor Peak, while Garrick, feeling tired, decided to head back. The two friends parted ways in the early afternoon, planning to meet back at the Bear Lake Trailhead at 6:30 p.m. Halpern, carrying an army knapsack with a few sandwiches, fruit, and a park guide, continued his hike alone.

When Halpern failed to return to the trailhead as planned, Garrick waited for three hours before alerting a park ranger. A search was launched that same night, with rangers using electric lights to scan the darkness. In the days that followed, the search intensified, with over 150 volunteers joining park rangers to comb the mountainous terrain. Their efforts were hampered by a snowstorm that struck the area a few days into the search. Despite their exhaustive efforts, no trace of Halpern was ever found. Park authorities checked the registers on nearby peaks, but Halpern's signature was nowhere to be found. The search parties were left with no clues as to whether he had become lost, been injured, or suffered a fatal fall.

In the years following his disappearance, there were several unconfirmed sightings of a man resembling Halpern in various parts of the country. These included reports of him in Phoenix, Arizona, in late 1933; traveling with the Civilian Conservation Corps in Nebraska in 1935; and with a circus in Michigan that same summer. Some speculated that he may have used the alias Louis Hollenbuck. However, none of these leads could be substantiated. The case of Joseph Halpern remains the oldest missing person case in the NamUs system. While the official investigation is no longer active due to the immense passage of time, authorities have collected DNA from his relatives in the hope that it might one day help to identify his remains if they are ever discovered. His family, particularly his father and brother, spent years searching for answers, writing letters to the park service and even the FBI. Despite their tireless efforts and the passage of nearly a century, the disappearance of the brilliant young scientist in the vast wilderness of the Rocky Mountains remains a profound and unresolved mystery.

Last Seen: Aug 15, 1933

Possible Unidentified Matches (7)

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.

80%Moderate
John Doe — Boulder, Colorado
UP61119 • Found Jun 20, 1971
View case
Sex ✓Male
Age 100%Est. 38–52 vs 22 when missing
Race 100%White
Location 89%50 mi away, same state
TimingFound 38 years after last seen
Height 100%5'8"–5'10" vs 5'8"
Weight 100%170–180 lb vs 165 lb
Hair 100%Brown vs Brown
Eyes 100%Brown vs Brown
79%Possible
John Doe — Fort Collins, Colorado - unidentified case UP4813
John Doe — Fort Collins, Colorado
UP4813 • Found Sep 16, 1994
View case
Sex ✓Male
Age 100%Est. 25–35 vs 22 when missing
Race 100%White
Location 95%28 mi away, same county
TimingFound 61 years after last seen
Height 100%5'9" vs 5'8"
Weight 90%140 lb vs 165 lb
Hair 60%Black vs Brown
Eyes 100%Brown vs Brown
78%Possible
John Doe — Denver, Colorado - unidentified case UP7173
John Doe — Denver, Colorado
UP7173 • Found Jan 8, 1997
View case
Sex ✓Male
Age 100%Est. 20–25 vs 22 when missing
Race 100%White
Location 83%73 mi away, same state
TimingFound 63 years after last seen
Height 100%5'7" vs 5'8"
Weight 100%160 lb vs 165 lb
Hair 100%Brown vs Brown
Eyes 100%Brown vs Brown
77%Possible
John Doe — Denver, Colorado - unidentified case UP13758
John Doe — Denver, Colorado
UP13758 • Found Nov 5, 1990
View case
Sex ✓Male
Age 100%Est. 30–40 vs 22 when missing
Race 100%White
Location 83%73 mi away, same state
TimingFound 57 years after last seen
Height 100%5'7" vs 5'8"
Weight 64%120 lb vs 165 lb
Hair 100%Brown vs Brown
Eyes 100%Brown vs Brown
76%Possible
John Doe — Glendale, Colorado - unidentified case UP11476
John Doe — Glendale, Colorado
UP11476 • Found Feb 10, 1998
View case
Sex ✓Male
Age 100%Est. 25–30 vs 22 when missing
Race 100%White
Location 82%77 mi away, same state
TimingFound 64 years after last seen
Height 100%5'8" vs 5'8"
Weight 82%196 lb vs 165 lb
Hair 60%Black vs Brown
Eyes 100%Brown vs Brown
76%Possible
John Doe — Fort Collins, Colorado - unidentified case UP454
John Doe — Fort Collins, Colorado
UP454 • Found Jul 12, 1997
View case
Sex ✓Male
Age 100%Est. 18–30 vs 22 when missing
Race 100%White
Location 95%28 mi away, same county
TimingFound 64 years after last seen
Height 68%5'11" vs 5'8"
Weight 100%160 lb vs 165 lb
Hair 100%Brown vs Brown
76%Possible
John Doe — Denver, Colorado
UP7163 • Found Oct 16, 1983
View case
Sex ✓Male
Age 100%Est. 20–30 vs 22 when missing
Race 100%White
Location 83%71 mi away, same state
TimingFound 50 years after last seen
Height 100%5'7" vs 5'8"
Weight 85%136 lb vs 165 lb
Hair 60%Black vs Brown
Eyes 100%Brown 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.

Unidentified photos are blurred because many are post-mortem. Tap a photo to reveal it.