CTE, a Degenerative Brain Disease, Found in 34 Pro Football Players

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Dec. 3, 2012

CTE has also been found in hockey players, wrestlers and boxers. It's still not possible to diagnose while a person is alive.

Seau's death in May prompted NFL player Jacob Bell to quit the sport altogether, leaving behind his contract with the Cincinnati Bengals.

PHOTO: Linebacker Jovan Belcher #59 of the Kansas City Chiefs walks off the field during his final game against the Denver Broncos, Nov. 25, 2012 in Kansas City, Missouri.

Jamie Squire/Getty Images

Linebacker Jovan Belcher #59 of the Kansas... View Full Size

Jamie Squire/Getty Images

Linebacker Jovan Belcher #59 of the Kansas City Chiefs walks off the field during his final game against the Denver Broncos, Nov. 25, 2012 in Kansas City, Missouri.

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"We're getting so much money, so much glory, so much fame; we're boosting our egos so much by playing a sport that's violent and could later on risk our lives," Bell said in May.

CTE researchers from Boston University were unavailable, and do not comment on players' deaths until more research is obtainable.

The Associated Press contributed to this report.