besides he escaped from jail once so he can probably do it again. or maybe they could do something like in silence of the lambs, use one phycopathic killer to get inside the mind of another phycopathic killer, that way we don't actually have to see the joker's face in his cell he could sit in the shadows and talk.

HEATH was the best joker......
but some will take his place in the next film....

Do you live in Texas? Because most states don't employ the death penalty, no matter how servere the charges. The Joker will hopefully live out the rest of his dys in Arkham Asylum and not be in anymore movies because I think it would be so wrong of the studio to try and replace Heath Ledger especially since he was so amazing as the Joker.