Chris Borland Retires: Players React After 49er Quits, Citing Head
49ers' Patrick Willis retires after injury-shortened season – The
Patrick Willis says his feet carried him away from the game
49ers LB Patrick Willis retiring after injury-shortened season
Patrick Willis set for MRI on toe - NBC Sports
49ers LB Patrick Willis retiring after injury-shortened season
49ers can't lose again - it's just math
Chris Borland Retires: Players React After 49er Quits, Citing Head
Patrick Willis Injury: Updates on 49ers Star's Toe and Return
Andrew Luck and Other Top NFL Players Who Retired Too Early
49ers LB Patrick Willis retiring after injury-shortened season
Patrick Willis Explains Decision to Retire from NFL
49ers LB Patrick Willis retiring after injury-shortened season
49ers LB Patrick Willis retiring after injury-shortened season