Former Miami Dolphins offensive tackle Jonathan Martin is retiring from the NFL.
Martin, a second-round pick of the Dolphins in 2012, was preparing for training camp with the Carolina Panthers but was battling a back injury.
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Martin spent last season with the San Francisco 49ers.
Martin, 25, started nine games with the 49ers in 2014.
He played his first two seasons with the Dolphins but in 2013 took a leave of absence, sparking what became an independent investigation into a bullying scandal with teammate Richie Incognito as the central antagonist.
