Jay Wechsler, 87, parked his car near the roundabout on Diamond Drive Thursday afternoon and embarked on a hike.
He apparently became disoriented and lost his way back out of the canyon.
Wechsler used his cell phone three times during the evening. First calling around 8 p.m. to say he was lost and later to describe his location along a dry creek bed or wash.
His final call was about 9 p.m.