Athlete Dies After Swimming 2.4 Miles of the Hudson River During Ironman Triathlon

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NEW YORK - JULY 18: Athletes compete during the New York City Triathlon in the Hudson River on July 18, 2010 in New York City. (Photo by Dario Cantatore/Getty Images) Photo: Dario Cantatore/2010 Getty Images

An unidentified 43-year-old man competing in today's Ironman U.S. Championship was hospitalized and later died after "experiencing distress" following the event's swimming portion. The cause of death is not yet known, but this isn't the first time this has happened: Last summer, two Nautica New York City Triathlon competitors also died in the Hudson.