49ers great Patrick Willis advances as Pro Football Hall of Fame finalist – NBC Sports Bay Area & California
49ers' Patrick Willis retires 'happy' – The Mercury News
49ers sign Philip Wheeler, release Trindon Holliday - NBC Sports
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
49ers Linebacker Patrick Willis, 30, Retiring
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
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Patrick Willis of San Francisco 49ers retires - ESPN
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News