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may 17, 2015 - Chris Borland retires

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49ers linebacker Chris Borland retires from football, becoming the first player to walk away in his prime out of fear of long-term brain damage.

Added to timeline:

How football has gotten where they are with concussions

ByMatthew LaPorte

23 Nov 2017

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Date:

may 17, 2015

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~ 10 years ago

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