Yellowstone National Park officials have confirmed that the search and rescue operation for Kim Crumbo has become a recovery mission. The cause of death for his brother, Mark O’Neill, has been determined; Mark died of exposure (hypothermia) and his remains were found on the east shore of Shoshone Lake. The two brothers were reported overdue by a family member on Sunday, September 19, 2021 when they didn’t return from their four-night backcountry trip to Shoshone Lake.

Help investigators:

If you have information that could help investigators piece together a timeline of events, or if you were in the Shoshone Lake area between September 12-19, 2021, please contact the NPS at 307-344-2428 or

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