49ers Linebacker Quits After 1 Season, Citing Safety Concerns : The Two-Way : NPR
San Francisco 49ers: Justin Smith Versus Patrick Willis in the Hall of Fame, News, Scores, Highlights, Stats, and Rumors
Troy Polamalu and Patrick Willis head first-time Hall of Fame picks, NFL News
Patrick Willis Retired in His Prime, But Where is He Now? - FanBuzz
The most physically grueling game I've ever played in': Remembering the Giants' 2011 NFC title game win over the 49ers - The Athletic
Patrick Willis Praises Ravens' New Offense
Bay Area Sports Hall of Fame an appetizer for 49ers' Patrick Willis
Hanging It Up: Retirement Is the Latest NFL Trend
Patrick Willis is Headed to the 49ers Hall of Fame
Patrick Willis: 49ers rift with Jim Harbaugh didn't cause retirement
49ers' Patrick Willis isn't in the Hall of Fame and is too busy to care - ESPN - San Francisco 49ers Blog- ESPN