Kirk Thomas-Olsen, a 61-year-old former park ranger, was found dead in Yosemite National Park over 20 days after he was expected to return from a solo hiking trip in the Ostrander Lake Area. He had embarked on the 11.4-mile hike from August 23 to 27, leaving a note on his vehicle detailing his return plans. Park rangers initiated a search when the note was discovered, and after extensive efforts, Thomas-Olsen's body was located. His niece, Holly Leeson, described him as an experienced hiker and expressed gratitude for the search efforts, while also highlighting the risks associated with solo hiking. The exact cause of death remains undisclosed, and officials have not provided further details regarding the circumstances of his passing. Leeson emphasized the importance of hiking with a companion for safety.