What is chronic traumatic encephalopathy?

Published On: May 06 2012 04:48:36 PM PDT   Updated On: Feb 03 2016 08:19:33 AM PST

Former Oakland Raiders quarterback and Super Bowl MVP Ken Stabler had the brain disease CTE, Boston University researchers said. Find out more about the progressive brain disease.

Junior Seau headshot
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Robert Bertoia/Getty Images

Reports say that Seau had acted erratically in the years before his death, getting arrested and driving an SUV off a 100-foot cliff. According to CNN, he'd told a friend he was worried about football-related brain damage.

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