McCunn had lived five months on the Brooks Range in 1976. In March 1981, he hired a bush pilot to drop him off at a remote, unnamed lake approximately northeast of Fairbanks, near the confluence of the Coleen and Porcupine Rivers, on the southern margin of the Brooks Range. McCunn intended to photograph wildlife for about five months. On this trip, he flew in with 500 rolls of film, of provisions, two rifles, and a shotgun. Believing he would not need them, he prematurely disposed of five boxes of shotgun shells in the river near his camp. Although McCunn thought he had arranged for the pilot to return for him in August, he had apparently never confirmed this. In early August, when the expected plane had not arrived, he wrote in his diary, "I think I should have used more foresight about arranging my departure. I'll soon find out." Apparently the pilot had told McCunn that he might be working in Anchorage at the end of the summer and that McCunn should not count on his help; according to the pilot, McCunn had given him money to repair his plane and to fly him into the remote site. By mid-August, it became obvious to McCunn that the bush pilot was not going to return for him. At this point he attempted to make his provisions last longer by shooting local game. He shot ducks and muskrats and tried drying the meat of a caribou he observed die in the lake. At this point, McCunn's diary indicated his hope that his family or friends would send someone to look for him after he failed to return. He had sent three maps with his campsite marked to some friends and his father, but was not clear about his exact itinerary. Although his father knew he would be in the area, he did not know when McCunn planned on returning. McCunn had also told his father not to be concerned if he did not return at the end of the summer, as he might stay later in the season if things went well. After McCunn was late to return from a prior trip, his concerned father had contacted the police; McCunn had asked his father not to do that again. McCunn's friends testified at the inquest they were not concerned as they believed he had already come out and was working in Paxson.
Sighting
An Alaska State Trooper flew over the lake in late August and observed McCunn's campsite. The pilot did not sense McCunn was in distress, since he waved his orange sleeping bag very casually and, on his third pass of the campsite, he saw McCunn casually walking back to his tent. The State Trooper later testified he saw no reason to surmise McCunn needed any assistance. McCunn later wrote in his diary: "I recall raising my right hand, shoulder high and shaking my fist on the plane's second pass. It was a little cheer like when your team scored a touchdown or something. Turns out that's the signal for 'ALL O.K. — DO NOT WAIT!' It's certainly my fault I'm here now!... Man, I can't believe it.... I really feel like a klutz! Now I know why nobody's shown up from that incident." Afterward, McCunn discovered a small cache of supplies, including rabbit snares and a few bits of candles, while digging a shallow trench to prepare for winter. A State Trooper who had spoken with McCunn before his trip and helped him mark his campsite on a map stated that he was aware of a hunting cabin located from his campsite. It is unclear why McCunn did not use it when the weather began getting colder. Eventually snow began falling and the lake froze. Game became increasingly scarce, and McCunn set snares for rabbits, but the traps were frequently raided by wolves and foxes. By November, McCunn had run out of food. He considered trying to walk to Fort Yukon, approximately away, but was unable to make the trek due to snow and his weakened condition. By Thanksgiving he wrote of having dizzy spells and almost constant chills.
Death
Sometime soon afterward, McCunn decided to end his own life. He used all his remaining fuel supplies to create a warm fire. He wrote, "Dear God in Heaven, please forgive me my weakness and my sins. Please look over my family." He wrote a letter to his father instructing him how to develop his film. He also requested that all his personal belongings be given to his father by whoever found him. McCunn even suggested that the person who found him take his rifle and shotgun for their trouble. He then pinned his Alaska driver's license to the note and shot himself with his rifle. Just before his suicide he wrote in his diary: "They say it doesn't hurt." By January, McCunn's friends became concerned enough to request the authorities begin a search for him. On February 2, 1982, a ski-equipped plane carrying several State Troopers landed at the lake to check McCunn's campsite. They found his tent zipped shut and, upon cutting it open, discovered his corpse, emaciated and frozen, along with his 100-page diary. Excerpts from McCunn's diary were published in December 1982 by The San Antonio Light.
