The 58-year-old True, whose extreme-distance running prowess is detailed in the book “Born to Run,” set out on what—for him—would have been a routine 12-mile run Tuesday from The Wilderness Lodge and Hot Springs, where he was staying. He left his dog at the lodge and never returned. A search began the next day. Lodge co-owner Dean Bruemmer, who helped with the search Saturday, said he last saw his friend at breakfast. He said True gave no indication of a specific route, which made the search more...