Evidently it is not SCOTUS. They refused to hear the case of Terry Schiavo. Starving and dehydrating any person to death would fall under the rubrick of "cruel and unusual", no?
Since the state was not doing that as some form of punishment for a crime, apparently they didn't think it was in the scope of their authority.
I think it's cruel and unusual way to die, but it's a stretch to say that she had been "sentenced' to it for a crime.
Word games like that don't interest me BTW.