The New York Jets agreed Sunday night to trade the veteran linebacker to the Pittsburgh Steeler.
The Jets also are sending a 2022 seventh-round draft pick to the Steelers for Pittsburgh's 2022 fifth-rounder.
The deal moves Williamson from the winless Jets, who are 0-8 after a 35-9 loss at Kansas City, to the 7-0 Steelers, the league's only undefeated team after a 28-24 win at Baltimore.
Bell signed a few days later with Kansas City and ran for 7 yards on six carries against his former team Sunday.
Williamson was signed by the Jets to a three-year, $22.5 million contract in 2018 and quickly established himself as a key playmaker.