Dov Kleiman on Twitter: Former #Browns, #Packers Center JC
NFL Players Association not happy with league's proposed wristband
Former Browns C JC Tretter Announces Retirement, 'Doubling Down
JC Tretter, former Cleveland Browns center, retires after 8
JC Tretter Announces Retirement
Browns center and NFLPA president, JC Tretter, announces his
Browns to play QB Jacoby Brissett, other starters in final
Ex-Packer Center Retires from NFL.
J.C. Tretter announces retirement from football - Daily Norseman
Done playing football, former starting center of the Cleveland
49ers' Alex Mack announces retirement: 'I am so grateful to the