The one-time 49er suffered a back injury and has decided to call it a career at this point. The good news, if you want to call it that, is that this had nothing to do with his time at the 49ers, unlike the various other retirements this offseason.
The San Francisco 49ers had more than their fair share of retirements this offseason. Now, we can add an ex-49er to the list. Brief 49ers tackle Jonathan Martin has decided to retire, according to Ian Rapoport. The retirement is due to a back injury Martin suffered during an offseason workout.