Patrick Willis' Shock Retirement Marks Official End of Jim Harbaugh-Era 49ers, News, Scores, Highlights, Stats, and Rumors
49ers: 5 former players who could come out of retirement to play
San Francisco 49ers All-Pro LB Patrick Willis expected to retire due to injury, reports say
49ers hit hard after unexpected offseason departures - The Boston Globe
49ers linebacker Patrick Willis considering retirement at 30
49ers' Patrick Willis denied in bid for Pro Football Hall of Fame
Report: Former Ole Miss great Patrick Willis to retire
San Francisco 49ers LB Patrick Willis expected to retire
49ers' Patrick Willis retires 'happy' – The Mercury News
49ers defensive end Justin Smith announces his retirement - Los Angeles Times
NFL Star Patrick Willis Now Working in Silicon Valley
State Your Case: Patrick Willis' days were short but his impact was HOF worthy - Talk Of Fame