TAMPA, Fla. (AP) -A disease that causes irregular heart rhythms most likely caused South Florida running back Keeley Dorsey's fatal collapse while lifting weights at the school's athletic facility in January.
Dr. Laura Hair, a Hillsborough County associate medical examiner, said Thursday the 19-year-old freshman appears to have had an undiagnosed genetic heart disorder called Long QT Syndrome, but tests on his DNA were unable to confirm it. He was pronounced dead at a hospital on Jan. 17.
``I think it's the most likely possibility,'' Hair said of Dorsey's death. ``It was natural. I didn't find any reason it wasn't natural.''
Long QT Syndrome is a disorder of the electrical activity of the heart that can cause dangerous, rapid and chaotic heart rhythms. The result is a lack of adequate blood supply to the brain, causing blackouts, fainting or sudden cardiac death.
Hair said efforts to restart Dorsey's heart were unsuccessful.
``I think he died very quickly,'' she said.
Dorsey rushed for 68 yards on 10 carries in 2006. He scored his only touchdown on a 52-yard run on the final play of the Bulls' 41-10 season-opening victory over McNeese State. It was South Florida's longest run of the season.

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