In the epilogue of George R.R. Martin's book A Storm of Swords, Lady Catelyn Stark (Michelle Fairley), who died in Season 3's infamous "Red Wedding," was resurrected as a new character known as Lady Stoneheart. In the books, after Stark's corpse was thrown in the river, she was rescued by The Brotherhood Without Banners, after their leader Beric Dondarrion gave his life for hers. Stoneheart takes over the brotherhood and leads them on a quest for vengeance in the books.
During a new interview with Entertainment Weekly, Michelle Fairley