49ers announce Patrick Willis is retiring - NBC Sports
49ers linebacker Patrick Willis considering retirement at 30
49ers' loss of Patrick Willis a jarring one – The Mercury News
Report: 49ers expect Patrick Willis to retire
Patrick Willis, Justin Smith retiring from 49ers - NBC Sports
Linebacker Patrick Willis To Announce Retirement
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
Remembering Patrick Willis' Ole Miss career - Red Cup Rebellion
Did 49ers legend Patrick Willis just hint at an NFL comeback?
49ers Patrick Willis retiring after injury-shortened season – The Denver Post
Report: 49ers expect Patrick Willis to retire
Report: Former Ole Miss great Patrick Willis to retire