Authorities on Tuesday called off a search near Fort Collins for a man missing since last week as two snowmobilers missing a day were found and a Loveland hiker was found after spending three nights in the cold. Rescuers found Shaun Green, 23, of Loveland, slumped over a rock and suffering from extreme exposure leading the first rescuers to think he was dead, Boulder sheriff's Detective Kevin Parker said. Green, an experienced camper, had been missing for three nights in an area between Estes Park and Lyons. He was reported missing when he didn't show up for a meeting Friday. He was flown to Longmont United Hospital where he was reportedly listed in good condition. Near Fort Collins rescuers ended their search for Bart Strain, 30, who was last seen near the Buckhorn Canyon ranger station. Larimer County officials said he may have been hiking or hunting. Strain was reported missing Tuesday but the search began Thursday after Strain's car was found near the ranger station. Over the weekend, up to 50 rescuers were searching for Strain, but found no sign of him. On the Grand Mesa in western Colorado, rescuers in a search airplane spotted two missing snowmobilers walking on the Grand Mesa. The two, one in his 50s and the other in his 20s, were reported missing late Sunday, said Mesa County sheriff's Sgt. Matt Lewis. Details of their survival were not immediately available. Meanwhile, Adam Roach, 26, of Libertyville, Ill., whose body was found near the Colorado National Monument may have died instantly when he fell 30 feet, Mesa County deputy coroner Dr. Dean Havlik said. Roach, who was last seen Jan. 24, was found near a trail.