Former Browns center JC Tretter announces retirement from NFL
Former Packers offensive lineman JC Tretter retiring from NFL
JC Tretter Retires From NFL After Nine-Year Career - Sports
JC Tretter Retires from NFL at 31; Former Packers, Browns Center
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JC Tretter, NFLPA president and former Browns center, retires
JC Tretter, former Cleveland Browns center, retires after 8
Former Browns center J.C. Tretter announces his retirement
JC Tretter announces retirement - BrownsZone with Scott Petrak
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JC Tretter makes retirement decision amid blackball speculation
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