Robert Alan Wildoner, 76, of Apple Valley, California, was last seen May 4, 2021, after heading into the remote Saline Valley of Death Valley National Park to repair a truck he had left there when it broke down over Easter. A final call to his wife was made before he lost cell service; he planned to return home within a few days but never did.

His abandoned truck was located near Saline Valley Warm Springs Campground and searches began May 8, 2021. Inyo County conducted ground and aerial operations with search-and-rescue teams, canines and aerial reconnaissance, but extreme heat and rugged terrain severely limited efforts and no sign of him was found.

A damaged sandal believed to be his was recovered in 2023, and some have speculated he may have become disoriented at night and fallen or sought shelter in nearby unstable caves that can collapse. The case remains unresolved and the family has no confirmed whereabouts for him.

If anyone was in or near Saline Valley around early May 2021 and remembers seeing Robert, his truck, or anything unusual, please come forward with information.