Rock Climber Found Deceased on Mount Lemmon, Body of avid rock climber found on Mount Lemmon, Authorities identify dead climber found on Mt. Lemmon, Climber Dies on the Lemmon 10/02/13 - Climber David Webster dies on the mountain. A post on Facebook and Supertopo indicate that it was a heart attack (this was later partly confirmed here Medical examiner: Mt. Lemmon climber may have died from natural causes).