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Eckhart's character, a District Attorney who becomes the villain Two-Face, was assumed to be dead at the close of The Dark Knight.
The 40-year-old had earlier insisted that his character would not be back for Christopher Nolan's proposed superhero sequel, but he has since discussed the circumstances in which Two-Face may make an appearance in the next instalment.
He told MTV: "I think Harvey - if he's not dead - is in a serious coma and I'm not sure he's coming out. They might pull the plug on him."
More: Aaron Eckhart, Movies
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