Roger Goodell on Chris Borland, playoff expansion, NFL in Los
NFL Brain Injury: 49ers Anthony Davis won't play in 2015 - Sports
Chris Borland Retires from 49ers: Twitter Reacts to LB Retiring
Chris Borland finding life after football isn't easy
Seven most shocking retirements in sports history - Sports Illustrated
Chris Borland says he'll repay 49ers most of signing bonus
San Francisco 49ers' Chris Borland retiring from NFL
Chris Borland says NFL rookies told to 'get a fall guy'
Chris Borland to pay back part of signing bonus
Chris Borland retires after one season - NBC Sports
2014 NFL draft: Grading each team's picks three years later
How San Francisco 49ers' Chris Borland made his decision to retire
49ers LB Chris Borland won't be last to retire early for safety
49ers LB Chris Borland won't be last to retire early for safety reasons