The new deal culminates a sudden turn of events for the fifth-year back. In the aftermath of Kareem Hunt's release and Spencer Ware's hamstring injury, Williams has eclipsed 100 yards from scrimmage in each of the past two games, including a career-high 103 rushing yards against the Seattle Seahawks last weekend.
Williams has scored five touchdowns in the past month while also catching 19 passes. He's averaging 5.3 yards per carry this year.
Williams, who spent the previous four seasons with the Miami Dolphins, was set to become an unrestricted free agent.