Patrick Willis Explains Decision to Retire from NFL
Seahawks trade for TE Jimmy Graham - The Boston Globe
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
Patrick Willis Explains Decision to Retire from NFL
San Francisco 49ers: Justin Smith Versus Patrick Willis in the Hall of Fame, News, Scores, Highlights, Stats, and Rumors
Has there been another NFL player that was very talented that retired at an earlier age than Andrew Luck? - Quora
Why early NFL player retirements actually make sense
Patrick Willis Explains Decision to Retire from NFL
Patrick Willis retiring from 49ers after injury-shortened season, NFL