Well known hockey brawler's brain evidences CTE

Rob Probert, a former Red Wing, was known as an "enforcer" in the NHL with more than 3300 penalty minutes over his 16 year career.  When he collapsed and died of heart failure in July, 2010, his autopsied brain showed substantial evidence of chronic traumatic encephalopathy.  As with many football players, Probert's brain suggests that repeated concussions result in permanent brain damage that can become debilitating over time.