The Carolina Panthers were hit with a surprise days before training camp opens in Spartanburg with the news that offensive tackle Jonathan Martin is retiring. News first broke from Ian Rapoport of the NFL Network who says the 25-year-old offensive tackle was facing back surgery, which prompted him to retire.
Martin is perhaps best known for his public feud during the Miami Dolphins' bullying scandal. He found himself traded to the 49ers to play under Jim Harbaugh last year, then signed with the Panthers early in free agency.