Browns release C JC Tretter
JC Tretter, NFLPA president and former Browns center, retires after nine seasons
Vikings Never Returned JC Tretter's Phone Call
J.C. Tretter announces retirement from football - Daily Norseman
Potential Landing Spots for Former Browns Center JC Tretter
JC Tretter, former Cleveland Browns center, retires after 8 seasons in NFL but remains NFLPA president - ESPN
JC Tretter Retires From NFL After Nine-Year Career - Sports Illustrated
Former Browns center JC Tretter announces retirement from NFL
The Browns are releasing center JC Tretter
Prominent NFL Veteran Announces His Retirement
The NFL cast JC Tretter out; the NFLPA president says that only makes him more powerful - Sports Illustrated
JC Tretter announces retirement from NFL action
Free agent JC Tretter retires, will focus on NFLPA role - National Football Post