Medical examiners have failed to identify what killed 26-year-old world champion swimmer Alexander Dale Oen, who collapsed on Monday in Arizona. Teammates of Dale Oen found the swimmer unresponsive in the shower after a day of light training in Flagstaff, where he was participating in an altitude camp. His death was initially reported as a suspected heart attack, but officials said the autopsy uncovered no anatomic abnormalities in his heart nor any trauma. Dale Oen became the first Norwegian man to earn an Olympic medal for swimming in 2008. He won the 100-meter breaststroke at the world championships last year.
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