Patrick Willis social media post appears to announce retirement - Niners Nation
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Free agent linebacker Jason Worilds to retire - NBC Sports
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Chris Borland retires after one season - NBC Sports
49ers LB Patrick Willis retiring after injury-shortened season – New York Daily News
Patrick Willis Explains Decision to Retire from NFL
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49ers legend Patrick Willis reflects on his career, shares advice to Fred Warner
Report: Former Ole Miss great Patrick Willis to retire
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