Oh, ER. Not again, not again.

If you watched last night's episode of ER, you saw the return of Dr. John Carter. His wife is visiting family in Paris, and he's back in Chicago to...well, we don't exactly know why he's back yet, but he's actually going to be working part-time at County General again. That's the only good news about what happened last night (I thought this was just going to be a quick visit by Wyle for a few episodes, I didn't realize he'd be working at the hospital again) because the ending probably made longtime ER fans sigh and/or grit their teeth.

The last scene showed Carter hooked up to...well, I'm not a doctor, but I'm assuming it's a dialysis machine or some sort of cancer treatment? He had a haunted look on his face, and he had a rather somber attitude throughout the entire episode. Scenes from episodes coming up showed Carter saying that he came back to Chicago specifically to talk to Dr. Banfield (?) and we also saw a scene of Carter dropping to the floor in the emergency room looking really, really bad.

Are they going to kill off Carter a la Mark Greene?