NFL linebacker retires at 24 years old, cites concerns over long-term brain injury

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UP NEXT
'Boys in Blue' follows police and student athletes in Minneapolis
06:52
Trump concocts dubious score to win his own golf tournament
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Rare: Obama and Bush face off, as ESPN’s Stephen A. Smith crowns Best “Presidential Athlete”
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More Americans are 'die-hard' NFL fans over other sports, polling shows
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