PITTSBURGH — The Pittsburgh Steelers escaped with a victory. The health of their franchise quarterback is another matter.

The Steelers edged the woeful Kansas City Chiefs 16-13 in overtime Monday night but lost Ben Roethlisberger for most of the second half — and perhaps longer — with a right-shoulder injury.

Roethlisberger left early in the third quarter after getting slammed to the turf by Kansas City linebackers Tamba Hali and Justin Houston. Pittsburgh coach Mike Tomlin said Roethlisberger was taken to a hospital for evaluation; Tomlin declined to speculate on the severity of the injury.

The Steelers (6-3) posted their fourth consecutive victory. Shaun Suisham kicked a 23-yard field goal 55 seconds into the extra period, one play after Lawrence Timmons intercepted Kansas City's Matt Cassel and returned the ball 23 yards to the 5.

"We just stayed positive," Timmons said. "It's easy to get down on yourself, but we are not like that. We stand up, face adversity."

Jamaal Charles ran for 100 yards and a score for the Chiefs (1-8), who have lost six straight.

Cassel drove Kansas City 52 yards — converting a fourth-and-15 in the process — to set up a 46-yard field goal by Ryan Succop as time expired.

Roethlisberger was 9 of 18 for 84 yards and a touchdown when Hali came down on top of him.

Byron Leftwich, playing for the first time in two years, was rusty in relief. He completed 7 of 14 passes for 73 yards and led a drive for a field goal that produced a 13-10 lead with 12:37 remaining.

"After four or five plays, it was like riding a bike," Leftwich said.