49ers hit hard after unexpected offseason departures - The Boston Globe
Willis retirement hits 49ers in the gut – SFBay
Patrick Willis explains why he had to retire in prime of career
Patrick Willis' Shock Retirement Marks Official End of Jim Harbaugh-Era 49ers, News, Scores, Highlights, Stats, and Rumors
NFL Free Agency: Patrick Willis, Justin Smith expected to retire; Colin Kaepernick on the trade block? - Field Gulls
Report: Former Ole Miss great Patrick Willis to retire
Patrick Willis, retired San Francisco 49ers all-Pro linebacker, guest speaker at Jackson-Madison County Sports Hall of Fame - WNWS Radio - Jackson, Tennessee, USA
49ers Linebacker Patrick Willis, 30, Retiring
49ers LB Patrick Willis to retire - ABC13 Houston
Why would an NFL star retire when he can still play? Patrick Willis explains why he walked away in his prime
Patrick Willis, Justin Smith retiring from 49ers - NBC Sports
Patrick Willis to retire after 8 seasons with San Francisco 49ers - Niners Nation