YELLOWSTONE NATIONAL PARK, Wyo. – Search efforts continue for a Minnesota native who is missing after embarking on a hike in Yellowstone. The National Park Service says 22-year-old Austin King-Henke was last heard from around 7 p.m. on Tuesday, Sept. 17 when he called a family member from Eagle Peak, described online as the highest spot in Yellowstone and one of the most remote areas (based on distance from an established road) in the lower 48.