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.

Flynn was last seen in Llano, California at 9:00 a.m. on May 1, 2016. He told his family he was going for a hike in the San Gabriel Mountains for a few days.

Zaldivar was last seen in Rialto, California on January 25, 2016. He left home early that morning without telling anyone and has never been heard from again.