Jonghyun Won was last thought to be in Grand Canyon Sept. 17, 2017. His vehicle was sighted near New Hance Trailhead and found abandoned at Moran Point.

Butler was last seen in Tusayan, Arizona on August 1, 2017. He is from Ohio and had driven to Arizona to visit the Grand Canyon.

Roberts was last seen in Grand Canyon National Park in Arizona. He and a group had started a nine-day hike on the Shivwits Plateau in a remote portion of western Grand Canyon, when he got separated from the others.