JC Tretter, NFLPA president and former Browns center, retires after nine seasons
JC Tretter, former Cleveland Browns center, retires after 8 seasons in NFL but remains NFLPA president - ESPN
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JC Tretter on his $32.5 million contract extension with the Browns
JC Tretter will have 18 more months as NFLPA president - NBC Sports
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Cleveland Browns release center JC Tretter, save $8.25 million against salary cap - ESPN
431 Tretter Stock Photos, High-Res Pictures, and Images - Getty Images
Browns release JC Tretter, turning to Nick Harris at center