49ers linebacker Patrick Willis retiring from NFL
Patrick Willis Explains Decision to Retire from NFL
Patrick Willis Explains Decision to Retire from NFL
Patrick Willis Explains Decision to Retire from NFL
Niners' Willis Decides To Call It A career
Patrick Willis, American Football Wiki
Patrick Willis Says Change 'Must' Happen After 49ers Loss
San Francisco 49ers linebacker Chris Borland retires due to health fears, NFL News
Patrick Willis Explains Decision to Retire from NFL
Patrick Willis, Justin Smith retiring from 49ers - NBC Sports