49ers' Patrick Willis retires 'happy' – The Mercury News
Patrick Willis' Shock Retirement Marks Official End of Jim Harbaugh-Era 49ers, News, Scores, Highlights, Stats, and Rumors
Patrick Willis Explains Decision to Retire from NFL
Patrick Willis Explains Decision to Retire from NFL
Report: 49ers expect Patrick Willis to retire
San Francisco linebacker Patrick Willis announces his retirement - The Globe and Mail
49ers' Patrick Willis retires 'happy' – The Mercury News
Patrick Willis retires: 49ers LB ending NFL career - Sports Illustrated
Patrick Willis Explains Decision to Retire from NFL