Patrick Willis retiring from 49ers after injury-shortened season, NFL
Patrick Willis out for season
49ers' Willis retires after injury-shortened season
Patrick Willis' 49ers ready for Ray Lewis' Ravens – The Mercury News
49ers' Patrick Willis retires 'happy' – The Mercury News
Linebacker Patrick Willis is ready to retire, even though he's only 30 – The Denver Post
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
San Francisco 49ers linebacker Chris Borland retiring after rookie season because of concussion concerns