Sherry Stringfield

Sherry Stringfield is returning to ER, a source close to the deal has confirmed to TVGuide.com.

Stringfield's participation is the latest in a slew of alums who have signed off to send off the show in its final season, a group that already includes Anthony Edwards, Julianna Margulies and George Clooney.

Stringfield played Dr. Susan Lewis on NBC's medical drama from 1994-1996 and then returned to the show in 2001 for another four seasons. No word on how Dr. Lewis will reappear this time.