49ers Linebacker Quits After 1 Season, Citing Safety Concerns : The Two-Way : NPR
Willis out, Smith in for 49ers as upheaval on defense continues
Pro Bowl: Patrick Willis headlines 49ers' 8 selections - The Boston Globe
Patrick Willis to undergo season-ending toe surgery
Patrick Willis retiring from San Francisco 49ers after injury-shortened season – Daily News
Never overlook 49ers LB NaVorro Bowman - ESPN
San Francisco 49ers All-Pro LB Patrick Willis expected to retire due to injury, reports say
Patrick Willis is 'no-brainer' Hall of Famer, DeMeco Ryans believes – NBC Sports Bay Area & California
49ers Place LB Patrick Willis on Injured Reserve
File:Patrick Willis on field pregame at Eagles at 49ers 10-12-08.JPG - Wikipedia
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
Season over for 49ers LB Patrick Willis
49ers Patrick Willis Retiring
49ers Place LB Patrick Willis on Injured Reserve
Patrick Willis fine playing either inside linebacker spot - NBC Sports