Patrick Willis of San Francisco 49ers to announce retirement - ESPN
From His First to Last, Patrick Willis Remembers His 49ers HOF Career
Patrick Willis, American Football Wiki
Why would an NFL star retire when he can still play? Patrick Willis explains why he walked away in his prime
49ers Linebacker Patrick Willis, 30, Retiring
Patrick Willis - Wikipedia
49ers Linebacker Patrick Willis Revolutionizes Tie Fashion In Retirement Press Conference
Bleacher Report - San Francisco 49ers make it official: Patrick Willis will retire. Details
San Francisco 49ers: Who Will Replace Patrick Willis and Chris Borland?, News, Scores, Highlights, Stats, and Rumors
Patrick Willis' retirement a jarring one for 49ers – Times Herald Online
Patrick Willis retirement came at right time for post-career pursuits
49ers' Patrick Willis at peace with decision to retire
NFL star Patrick Willis is thriving in retirement as a Silicon Valley tech worker
Why would an NFL star retire when he can still play? Patrick Willis explains why he walked away in his prime
Might ex-49ers star Patrick Willis come out of retirement?