Former Browns center JC Tretter announces retirement from NFL
Former Browns center, NFLPA president JC Tretter retires National
JC Tretter, former Cleveland Browns center, retires after 8
JC Tretter on Twitter] onto the next chapter : r/Browns
Former Browns center JC Tretter announces retirement from NFL
JC Tretter announces retirement - BrownsZone with Scott Petrak
Latest NFL free agency signings, news - The Washington Post
Free agent JC Tretter retires, will focus on NFLPA role - National
JC Tretter, former Cleveland Browns center, retires after 8