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Chapter Thirty-Nine, "The Wedding". After having seen a prologue depicting the aftermath of the Red Wedding, this chapter fully depicts what actually happened. The build up to the Red Wedding, is seen from Catelyn and Robb's POV, before it eventually comes to Myra's POV, in which there's a moment of quiet reflection on her part, only for her to be roused from her thoughts by "The Rains of Castermere" playing... From then on, Myra's whole world is just completely destroyed when the massacre starts, with her pregnant goodsister being stabbed in the belly multiple times, her mother and brother being hit by crossbows, all while fellow Northerners and Riverlanders loyal to Robb are killed right before her eyes as she is essentially held captive by Roose Bolton. It gets worse when Robb is stabbed in the heart by Roose Bolton, who utters "Jaime Lannister sends his regards"; Myra rushes over dead bodies to hold her twin brother in her arms as he dies, pleading for Robb to stay with her before he breaths his last words. Afterwards, Myra is left in denial, pleading for Robb to come back to her and get back up, before she is torn away screaming from her brother by the Freys.
Myra: He couldn't die. Her twin couldn't die. Their lives were intertwined, hers and his. Where one went, the other followed. Where one fell, the other lifted up. Robb couldn't die because she wouldn't let him. He had to live because she was alive. He couldn't die. He couldn't. Robb Stark had to live.
Post-Red Wedding, Jaime, still coming to terms with the loss of his sword hand, is accused by Myra of being involved with orchestrating the event. She even goes so far as to call him Kingslayer, the usage of which hurts Jaime even more for she had never used that phrase before. Even though Jaime manages to convince her that he didn't have anything to do with the Red Wedding, Myra is wracked with guilt over having chosen Jaime over her family.
Jaime: "She blames me, you know." Jaime continued. "She chose me over her brother, and she lost him for it."
