Photos: Athletes and CTE had the most advanced stage of CTE when he died in March at the age of 46. Hide Caption 1 of 22 Photos: Athletes and CTE BMX star Dave Mirra, who was found dead of a self-inflicted gunshot in February, was found to have CTE. Hide Caption 12 of 22 Photos: Athletes and CTE Offensive lineman Terry Long of the Pittsburgh Steelers committed suicide by drinking antifreeze. Hide Caption 19 of 22 Photos: Athletes and CTE Reggie Fleming, who played for six NHL teams, was the first hockey player to be diagnosed with CTE. Hide Caption 22 of 22"Unfortunately the only definitive way to determine CTE is with an autopsy," said Gupta, CNN's chief medical correspondent.

Source: CNN January 13, 2017 19:18 UTC