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Cause of Death Determined For Yellowstone Visitor While The Search Continues For His Brother

In a press release Wednesday morning from Yellowstone National Park officials, it was determined that missing hiker, 67-year-old Mark O’ Neill from Chimacum, Washington, succumbed to hypothermia.

O'Neill and his brother, 74-year-old Kim Crumbo of Ogden, were reported late in returning from a four-night backcountry camping trip in the park. O'Neill's body was recovered on September 20th.

The search for Crumbo has transitioned from a rescue search to a recovery mission.

Caroline Long is a science reporter at UPR. She is curious about the natural world and passionate about communicating her findings with others. As a PhD student in Biology at Utah State University, she spends most of her time in the lab or at the coyote facility, studying social behavior. In her free time, she enjoys making art, listening to music, and hiking.