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49ers LB Chris Borland retires because of head trauma risks
1:03 | NFL
49ers LB Chris Borland retires because of head trauma risks
Tuesday March 17th, 2015

San Francisco 49ers linebacker Chris Borland told Outside the Lines on Monday night that he is retiring from football at the age of 24. Many NFL players and other athletes reacted to the news on Twitter.

St. Louis Rams DE Chris Long:

Seattle Seahawks quarterback Russell Wilson:

New York Giants tackle Geoff Schwartz:

Cincinnati Bengals guard Kevin Zeitler:

Denver Broncos linebacker Brandon Marshall:

 

Seattle Seahawks linebacker Bobby Wagner:

Wisconsin guard Josh Gasser: 

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