The 32-year-old Kelly has spent his entire nine season NFL career with the Oakland Raiders. He’s played in 129 games during that time, recording 420 tackles, 34.5 sacks and nine forced fumbles.
Kelly, who is 6-foot-6 and 325 pounds, was released by the Raiders March 27. He joins a Patriots defensive front that includes Vince Wilfork, Kyle Love and Brandon Deaderick.
Kelly played in all 16 games last season, tallying 46 tackles and 1.5 sacks.
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Madison Park, Keith Allen and Andreas Preuss, CNN