JC Tretter announces his retirement - NBC Sports
Former Browns center JC Tretter retires, will stay on as NFLPA president
J.C. Tretter: Breaking News, Rumors & Highlights
3 Things To Look Out For At 49ers Training Camp: Offense Edition - Sactown Sports
Former Browns center, NFLPA president JC Tretter retires
Former Browns center JC Tretter announces retirement from NFL
The Browns are releasing center JC Tretter
J.C. Tretter net worth: How much did ex-NFL star earn in salary and contract?
NFLPA president JC Tretter announces retirement from NFL - NBC Sports
JC Tretter Retires from NFL at 31; Former Packers, Browns Center Is NFLPA President, News, Scores, Highlights, Stats, and Rumors