Former Browns center JC Tretter retiring after 8 NFL seasons, will stay on as NFLPA president
Browns center J.C. Tretter, the new NFLPA president, assessing 'long list of hurdles' for players - ESPN
JC Tretter, former Cleveland Browns center, retires after 8 seasons in NFL but remains NFLPA president - ESPN
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Browns, center JC Tretter agree to three-year extension - ESPN