Patrick Willis Retired in His Prime, But Where is He Now? - FanBuzz
22 NFL players who retired early, from Gronk to Barry Sanders
PFF All-Decade Top 101: The best NFL players from the 2010s, NFL News, Rankings and Statistics
In their primes, which LB duo was better? : r/panthers
Calvin Johnson: Bigger, Stronger, Faster and, Maybe Soon, Retired - The New York Times
22 NFL players who retired early, from Gronk to Barry Sanders
Why a Bay Area football star gave up his NFL dream for blue-collar job
San Francisco 49ers linebacker Chris Borland retires over head injury concerns - ESPN
NFL Players Who Retired In Their Prime
Borland: Young LB Steps Away, PFF News & Analysis
Top 10 NFL Players Who Retired Too Soon - HowTheyPlay
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
Rashard Mendenhall Is a Writer for the HBO Show Ballers