"[They] told emergency responders that [Spirio-Johnston] had wrecked on his bike a couple days ago, so they thought he was just being extra cautious and lagging behind," according to the release.
The sheriff's office and the National Park Service searched the area until dark, but couldn't find him. They returned Tuesday morning with bikes, all-terrain vehicles and a helicopter, and eventually found his bike with one flat tire by a ravine on the south rim of the canyon, but not Spirio-Johnston.
Searchers then spotted three canoes full of people pointing their paddles to the top of the cliffs, where the helicopter pilot found the missing man standing on the rim, waving. He was about three miles, as the crow flies, from where he abandoned his bike.
Spirio-Johnston appeared to be in good condition, according to the news release. He explained that he had found a place to sleep Monday, and tried walking back Tuesday but kept getting "ledged in," according to the release.