Why would an NFL star retire when he can still play? Patrick Willis explains why he walked away in his prime
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
Patrick Willis injury: San Francisco 49ers' linebacker will have season-ending toe surgery, placed on injured reserve - Sports Illustrated
49ers LB Patrick Willis' toe injury will require season-ending surgery
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
Patrick Willis retiring after eight seasons with 49ers
NFL notes: 49-ers' Willis done for season
Patrick Willis discussed toe injury and recovery - Niners Nation
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News