Happy,' Emotional Patrick Willis Announces Retirement From 49ers
Patrick Willis Explains Decision to Retire from NFL
Bleacher Report - San Francisco 49ers make it official: Patrick
Senior Bowl to Induct Patrick Willis and Four Others into Hall of Fame
Patrick Willis retiring after eight seasons with 49ers
Patrick Willis Explains Decision to Retire from NFL
Patrick Willis' Shock Retirement Marks Official End of Jim
Shocker: Patrick Willis to join Justin Smith in retirement
Patrick Willis closes door on return, discusses foot issues as reason
49ers' Patrick Willis retires 'happy' – The Mercury News
Former 49er Patrick Willis Has Gone from NFL LB to Silicon Valley