David Barclay Miller, 22, disappeared from the Sedona area after setting out on a planned two-and-a-half-day hike on May 19, 1998. A seasonal U.S. Forest Service employee and experienced outdoorsman, he was last seen by co-workers at the Beaver Creek ranger station and left a note saying he intended to hike in the Red Rock–Secret Mountain Wilderness. His vehicle was later found at the Vultee Arch Trail, the last known starting point of his trip.

Search and rescue teams spent 12 days combing Coconino National Forest’s canyons, cliffs and dense manzanita brush; intense heat hampered the effort and no trace of Miller was recovered. Over the years leads have emerged but none led to him. A body found in Phoenix in February 1999 with a green backpack marked Barclay was ruled not to be him, and a 2022 discovery of a late-1990s campsite in Secret Canyon produced clothing but no human remains. It remains unknown what happened to David; did anyone hike in the Vultee Arch or Secret Canyon area that May 1998 who might share details?