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Ros - Died Season 3, episode 6 'The Climb'
Poor Ros. After somehow managing to survive the journey from being a whore in Winterfell to being an employee of Petyr Baelish, she didn't live past betraying Littlefinger to aid Varys. For his revenge, Baelish gave Ros to Joffrey to be his plaything, and the King murdered her with the crossbow he is so proud of. At least Ros has the honor of being the first person Joffrey has killed. RIP.