On April 13, 2009, it was reported that Harrison gained a 6-year, $ million contract extension with the Steelers.  In four games in October Harrison had sacks, 25 tackles, two forced fumbles and a fumble recovery. He earned AFC defensive player of the month honors for October.  Harrison ended the Season with 79 tackles, 60 of them being solo, and 10 sacks. This outstanding performance made him a starter in the Pro Bowl that year. Although Heath Miller , LaMarr Woodley , and Casey Hampton were named pro-bowlers as well, Harrison was the only starter from his team.