Why did JC Tretter retire? NFLPA president and former Browns, Packers center explains decision and how NFL may have influenced it
Former Cleveland Browns C JC Tretter retires
Former Browns center, NFLPA president JC Tretter retires
J.C. Tretter, former Browns center and NFLPA president, retires from NFL - The Athletic
JC Tretter, former Cleveland Browns center, retires after 8 seasons in NFL but remains NFLPA president - ESPN
Former Browns center JC Tretter retiring after 8 NFL seasons, will stay on as NFLPA president
JC TRETTER RE-ELECTED AS PRESIDENT OF NFL PLAYERS ASSOCIATION
The NFL cast JC Tretter out; the NFLPA president says that only makes him more powerful - Sports Illustrated
JC Tretter had interest in Dallas Cowboys and Minnesota Vikings, believes NFLPA role led to cold free agent market
Former Browns center JC Tretter announces retirement from NFL