Fleet of Foot: The Carousel of Great 49ers Middle Linebackers
49ers' Chris Borland, 24, retires because of brain injury concerns - Los Angeles Times
49ers' Patrick Willis retires 'happy' – The Mercury News
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
Former Ole Miss standout Patrick Willis nominated for Pro Football Hall of Fame - SuperTalk Mississippi
Bruceton native Patrick Willis retiring after injury-shortened season - WBBJ TV
Report: 49ers expect Patrick Willis to retire
Patrick Willis retiring after eight seasons with 49ers
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
49ers' Patrick Willis lost for season (w/video)
Patrick Willis Explains Decision to Retire from NFL