Former Browns Center JC Tretter Retires From NFL
Former Browns center JC Tretter announces retirement from NFL
Latest On Retired C J.C. Tretter
The NFL cast JC Tretter out; the NFLPA president says that only makes him more powerful - Sports Illustrated
Cleveland Browns: JC Tretter retires from the NFL - Dawgs By Nature
JC Tretter announces his retirement - NBC Sports
Ex-Packer Center Retires from NFL.
JC Tretter Announces Retirement After Nine Seasons in the NFL - video Dailymotion
JC Tretter, NFLPA president and former Browns center, retires after nine seasons
Browns center JC Tretter and Seahawks linebacker Shaquem Griffin announce retirement
Former Browns center JC Tretter retiring after 8 NFL seasons, will stay on as NFLPA president