Report: 49ers expect Patrick Willis to retire
49ers' Willis retires after injury-shortened season
49ers News: LB Willis, CB Sherman selected to PFF's All-Decade
Patrick Willis still thriving after early 49ers retirement
NaVorro Bowman stops by 49ers facility, tells team he's retiring
Patrick Willis Explains Decision to Retire from NFL
49ers' Chris Borland, 24, retires because of brain injury concerns
San Francisco 49ers LB Patrick Willis expected to retire
Early Retirement in the N.F.L. and at Google, and the Paradox of
Ex-49er Patrick Willis, ex-Raider Darren McFadden in college hall
49ers add speedy wide receiver Torrey Smith on day of notable losses
Patrick Willis retiring from 49ers after injury-shortened season