(Spoiler alert if you aren't up-to-date on Game of Thrones, which really, you should be.)
Season four ended with Tywin Lannister's satisfying death, but now there's news the Lannister patriarch may indeed return, according to Charles Dance, who played Tywin Lannister:
1.
But then he went ahead and said some more anyway:
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We doubt he’ll come back as a White Walker so our bet is that he'll appear in a flashback. Either way he's guaranteed to stir up some trouble from beyond the grave.
[via Oh No They Didn't!]