Bleacher Report - San Francisco 49ers make it official: Patrick Willis will retire. Details
Reinjured Big Toe Ends Season for 49ers' Patrick Willis - The Washington Informer
Former 49ers' star linebacker Patrick Willis talks offseason moves, draft priorities
Did 49ers legend Patrick Willis just hint at an NFL comeback?
San Francisco 49ers - Wikipedia
Willis, Culliver among those injured at 49ers camp - Deseret News
Brother of 49ers' Patrick Willis chases dream at regional combine
Titans have lost faith in Malik Willis just one season after taking him in NFL Draft's third round, per report : r/steelers
Chris Borland's retirement: Is an NFL player's brain really more important than his feet?
Patrick Willis retiring from 49ers after injury-shortened season, NFL
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
49ers rookies: Film breakdown of LB Fred Warner's impressive first year - Niners Nation
Patrick Willis will definitely lend 49ers defense a hand
Retired 49ers LB Patrick Willis is now just another Silicon Valley tech geek
Might ex-49ers star Patrick Willis come out of retirement?