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Rickard Karstark earned his death by betraying Robb Stark and murdering the two Lannister children that the King of the North had been holding hostage. This wasn't the first time Karstark had acted insubordinate towards Robb, and so the Stark heir beheaded his follower for treason.
Aug. 3, 2012
Died in: Season 3, episode 5 "Kissed by Fire"