March 9, 2013, Harrison was released by the Steelers for salary cap reasons after they could not agree on a pay cut. Cincinnati Bengals Harrison signed with the Cincinnati Bengals on April 23, 2013. He recorded 30 total tackles (16 solo), 2 sacks and an interception in limited playing time. On March 13, 2014, he was released by the Bengals. Initial retirement and third stint with Steelers Harrison announced his retirement on August 30, 2014 and officially retired as a member of the Pittsburgh Steelers on September 5, 2014. On September 23, 2014, rumors surfaced that Harrison was set to return to the NFL after Mike Tomlin noted in a press conference that there were significant injuries suffered by members of the Steelers defense. The Steelers posted a message on their Twitter page announcing that Harrison would return to the Steelers. Harrison officially signed with the Steelers on September 23, 2014. He recorded 45 tackles and 5.5 sacks in 11 games. On March 22, 2015 Harrison signed a two-year extension with Pittsburgh for $2.65 million and a $500k signing bonus. On February 17, 2016, Harrison announced that he would be returning for a 14th season with the team. On November 20, 2016, Harrison surpassed Jason Gildon to become the Steelers' all-time sack leader with 77.5, during a 24–9 win over the Cleveland Browns and finished the season with 79.5 sacks during his Steelers career. On January 8, 2017, he recorded ten combined tackles, sacked Matt Moore 1½ times, and forced a fumble in a 30–12 AFC Wildcard victory over the Miami Dolphins. On March 1, 2017, Harrison signed a two-year contract extension with the Steelers. Through the first 12 games of the 2017 season, Harrison played only 29 snaps, with 15 of those coming in Week 6 against the Kansas City Chiefs. Following injuries to Ryan Shazier and Tyler Matakevich and the subsequent move of Arthur Moats from the outside to the inside linebacker position, Harrison played 11 snaps in Week 14 against the Baltimore Ravens. On December 23, 2017, Harrison was released by the Steelers after only playing in five games and being a healthy scratch for most of the season. New England Patriots and second retirement On December 26, 2017, Harrison signed a one-year contract with the New England Patriots. In his debut, Harrison registered two sacks, a forced fumble, and five total tackles against the New York