How 29 "Walking Dead" characters bit the dust and why their deaths mattered
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How we first met him: Arriving with his men to the scene of a military helicopter crash ("Walk With Me")
How he died: Stabbed through the back by Michonne ("Too Far Gone")
Why his death mattered: He was the chief villain of season 3 and part of season 4, and had brought a lot of misery and death upon our heroes. And he continues to haunt some of them, as soon when he appeared in hallucinatory form to a dying Tyreese.
— Alan Sepinwall