Patrick Willis retiring from 49ers after injury-shortened season, NFL
The biggest offseason needs for all 32 NFL teams and how teams can fill them - The Athletic
49ers linebacker Patrick Willis retiring after injury-shortened season
Former Ole Miss standout Patrick Willis nominated for Pro Football Hall of Fame - SuperTalk Mississippi
The best athletes to retire in their prime
The Denver Post: 2014 Broncos NFL season preview by Peter Dettmann - Issuu
49ers' loss of Patrick Willis a jarring one – The Mercury News
49ers' Patrick Willis retires 'happy' – The Mercury News
49ers' Patrick Willis retires after injury-shortened season
Has there been another NFL player that was very talented that retired at an earlier age than Andrew Luck? - Quora