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JC Tretter - Sports Illustrated
7-time Pro Bowl C Alex Mack retires after 13 years in NFL – KGET 17
JC Tretter retires after interest in playing for Vikings, other
J.C. Tretter net worth: How much did ex-NFL star earn in salary
Former Browns center JC Tretter retires, will stay on as NFLPA
Former Browns C JC Tretter Announces Retirement, 'Doubling Down
Former Cleveland Browns C JC Tretter retires
JC Tretter, former Cleveland Browns center, retires after 8