49ers hope Alexander can be next in the Willis-Bowman mold
49ers LB Willis retiring after toe surgery
49ers in flux as Patrick Willis, Justin Smith retire - Sports Illustrated
Patrick Willis' Shock Retirement Marks Official End of Jim Harbaugh-Era 49ers, News, Scores, Highlights, Stats, and Rumors
49ers' Patrick Willis lost for season (w/video)
Stathead] Fred Warner is stuffing the stat sheet unlike any defender in 49ers historysince Patrick Willis : r/49ers
Patrick Willis on NaVorro Bowman's injury recovery, Richard Sherman and Jim Harbaugh's intensity
NaVorro Bowman Is Half Of The Best Linebacker Duo In The NFL - CBS San Francisco
49ers sign Shayne Skov to practice squad, make Patrick Willis, Alfonso Smith transactions official - Niners Nation
49ers' Patrick Willis lost for season (w/video)
Patrick Willis: The Aftermath - Dynasty League Football
San Francisco 49ers legend NaVorro Bowman leaves behind his legacy
San Francisco 49ers rule Patrick Willis, Mike Iupati out against Denver Broncos - ESPN
Patrick Willis retiring from 49ers after injury-shortened season, NFL
Remembering the 49ers' devastating duo: Patrick Willis and NaVorro Bowman - Niners Nation