San Francisco 49ers linebacker Chris Borland retiring after rookie
Early retirement: Willis called it quits in his prime
49ers LB Patrick Willis retiring after injury-shortened season
49ers LB Patrick Willis retiring after injury-shortened season
From His First to Last, Patrick Willis Remembers His 49ers HOF Career
Hanging It Up: Retirement Is the Latest NFL Trend
Patrick Willis injury: San Francisco 49ers' linebacker will have
49ers LB Patrick Willis retiring after injury-shortened season
49ers LB Patrick Willis retiring after injury-shortened season
49ers LB Patrick Willis retiring after injury-shortened season
49ers LB Patrick Willis retiring after injury-shortened season
49ers' Patrick Willis at peace with decision to retire
49ers' Patrick Willis denied in bid for Pro Football Hall of Fame
Patrick Willis - Wikipedia