JC Tretter, former Cleveland Browns center, retires after 8 seasons in NFL but remains NFLPA president - ESPN
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Big Red pride: JC Tretter's path to NFL went through Cornell - ESPN - AFC North- ESPN
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Browns' Jedrick Wills Jr. will remain at left tackle, center JC Tretter's future uncertain
Why did JC Tretter retire? NFLPA president and former Browns, Packers center explains decision and how NFL may have influenced it
It starts with stopping Adrian Peterson
Vikings Left Ex-Browns C JC Tretter in the Dark, Insider Says