49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
San Francisco 49ers - Wikipedia
49ers' Willis retires after injury-shortened season
49ers' Patrick Willis retires 'happy' – The Mercury News
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
Patrick Willis, JFP Mobile
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
NaVorro Bowman stops by 49ers facility, tells team he's retiring as a 49er
49ers' Patrick Willis placed on IR - The Boston Globe
Patrick Wilson Announces Retirement