In the show, those who hadn't read the books were shocked when Catelyn Stark's throat was cut during the Red Wedding. That being said, while Catelyn does technically die in the books, it's not for long. In "A Storm of Swords," Catelyn's body is thrown into the icy waters and discovered by the Brotherhood without Banners. Lord Beric Dondarrion gives his life to revive her, but when she comes back, her body still mutilated, and she seeks vengeance on the Lannisters. Once this happens, she becomes known as Lady Stoneheart and her list of victims wind up even longer than Arya's. It's kind of a shame she wasn't brought back on the show, too.
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