Patrick Willis - Wikipedia
Mike DeVito values family in retirement decision
Patrick Willis retiring after eight seasons with 49ers
49ers' Patrick Willis retires 'happy' – The Mercury News
Steelers linebacker Jason Worilds shuns big NFL free agent contract, opts to retire at 27 – New York Daily News
49ers' Patrick Willis isn't in the Hall of Fame and is too busy to care - ESPN - NFL Nation- ESPN
Chris Borland Retires from 49ers: Twitter Reacts to LB Retiring from NFL at 24, News, Scores, Highlights, Stats, and Rumors
Patrick Willis Retired in His Prime, But Where is He Now? - FanBuzz
Patrick Willis says his feet carried him away from the game