After being cut for a fourth time, Harrison considered not playing anymore. Shortly thereafter, he was signed a fourth time by the Steelers during training camp in 2004 after Clark Haggans sustained an injury in an offseason weightlifting accident. Showing much improvement, Harrison made the final roster and remained with the Steelers through the 2012 season. Harrison later told the "Beaver County Times" that if not for Haggans's injury, he planned to retire from football at age 26 to focus on becoming a veterinarian, something that Harrison still plans on doing now that his football career has ended. Harrison also considered following in his father's footsteps to become a truck driver, and to this day does have a commercial driver's license.