JUL 27, 2015 3:06p ET
JUL 27, 2015 3:06p ET
Jonathan Martin played in 15 games with the San Francisco 49ers last season.
Former Miami Dolphins and San Francisco 49ers offensive tackle Jonathan Martin is retiring, FOX Sports 1's NFL insider Mike Garafolo confirmed Monday.
Martin, who was claimed by the Carolina Panthers this offseason, had a back injury that would've shelved him for the entire season, according to Garafolo.
The 25-year old offensive tackle had a year remaining on his four-year rookie deal.
NFL Media's Ian Rapoport first reported the news.