Mayo receives $50 million in new money, $27 million of which is guaranteed. The linebacker is set to make $3.4 million in 2012, making this, as a practical matter, a six-year, $53.4 million deal.
Mayo is one of the leaders of the Patriots' defense. He was selected to the Pro Bowl and named an All-Pro last season, but he has been slowed by a knee injury for much of this season. Mayo still ranks third on the team with 68 total tackles despite missing two games.