Fletcher, 27, originally entered the league as an undrafted free agent out of Montana in 2010. He has spent each of his four pro seasons with the Patriots, logging 81 tackles in 38 regular-season games played. He missed the entirety of the 2012 regular season after tearing his ACL in preseason play.
He played just more than 18 percent of the Patriots defensive snaps in 2013, but was a critical contributor on special teams. He will likely continue to be a primary contributor on special teams for Tampa Bay.
New Bucs GM Jason Licht was a member of the Patriots' personnel department when Fletcher was signed as an undrafted free agent.