Badgers football: Former UW great Chris Borland retiring from NFL after only one season, citing head injury worries
Got a debate going on right now about who to take if you had to choose one of these two. Who you taking? : r/49ers
Former Ole Miss star Patrick Willis expected to retire from 49ers
Report: 49ers' Patrick Willis planning to retire
49ers boast one of best linebacking corps around - The San Diego Union-Tribune
Patrick Willis Explains Decision to Retire from NFL
Patrick Willis Explains Decision to Retire from NFL
Patrick Willis retiring from 49ers after injury-shortened season, NFL
49ers LB Patrick Willis to retire - ABC13 Houston
49ers boast one of best linebacking corps around - The San Diego Union-Tribune