Hightower's agency, SportsTrust Advisors, tweeted the agreement on Wednesday and his agent Pat Dye, Jr confirmed it. The new pact is for four years and $43.5 million.
It brings back one of the Patriots' biggest free agents, who has helped New England win two Super Bowls in his five NFL seasons. He has 372 tackles and 17 sacks since being a first-round pick out of Alabama in 2012.
He also had one of the biggest plays in last month's Super Bowl. He forced a fumble on a sack on Atlanta's Matt Ryan in the fourth quarter, helping swing the momentum New England's way in its comeback 34-28 overtime victory.