PITTSBURGH (AP) -Pittsburgh Steelers defensive end Aaron Smith will miss the rest of the season with a torn rotator cuff in his right shoulder, an injury that significantly weakens what was the NFL's best defense the last two seasons.

The Steelers placed Smith on the injured reserve list Wednesday, which means he cannot play again this season. He is scheduled to have surgery later this week.

To replace Smith on their 53-man roster, the Steelers re-signed Ra'Shon ``Sunny'' Harris, a sixth-round draft pick that they cut in September. Harris had been on the Carolina Panthers' practice squad.Copyright © 2005 The Associated Press. All rights reserved. The information contained in the AP News report may not be published, broadcast, rewritten or redistributed without the prior written authority of The Associated Press.