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Alexander Dale Oen won the gold medal in the 100m breaststroke in the 2011 World Championships in Shanghai

Norwegian swimmer Alexander Dale Oen poses with the gold medal after winning the men's 100m breaststroke at the 2011 World Championships in Shanghai. Two-time double Olympic gold medallist Kosuke Kitajima has said the death of Dale Oen has left a "big hole" in his heart before their much anticipated duel at the London Games

Alexander Dale Oen (1985-2012)

Norway swimming gold-medal favorite Alexander Dale Oen died late Monday after suffering a cardiac arrest. He was with his national team training in Flagstaff, Arizona.