Chris Borland stuns 49ers with retirement announcement
Athlete to Educator: Chris Borland wants to talk
Chris Borland Retires from NFL at Age 24: Latest Details, Comments
Fearing brain injury, 49ers' Chris Borland retires after one year
49ers' Chris Borland retires over health concerns – The Mercury News
Chris Borland retiring out of concern for head injuries
Chris Borland slams Wisconsin football program in Netflix doc
San Francisco 49ers Chris Borland Retiring at 24, News
San Francisco 49ers rookie LB Chris Borland retires at age 24 over
24-year-old NFL player quits over concussion worries
Chris Borland Announces Retirement From NFL At 24 Over Concussion
Despite Chris Borland's retirement, football remains a personal