Coming off their season-opening win over the Titans, the Steelers flew to Soldier Field for a Week 2 interconference duel with the Chicago Bears.  In the first quarter, Pittsburgh struck first as quarterback Ben Roethlisberger completed a 1-yard touchdown pass to tight end Matt Spaeth.  However, in the second quarter, the Bears answered with quarterback Jay Cutler completing a 6-yard touchdown pass to tight end Kellen Davis. Pittsburgh would regain their lead in the third quarter as Roethlisberger got a 2-yard touchdown run, but in the fourth quarter, two missed field goals from kicker Jeff Reed would lead to Cutler's 7-yard touchdown pass to wide receiver Johnny Knox and kicker Robbie Gould's 44-yard field goal.
How many yards  was the touchdown pass between Cutler and Knox?
7