How Does The Mountain Die in Game of Thrones? Dies in: Episode 5, "The Bells" How he goes out: Gregor "The Mountain" Clegane is able to withstand stabs to the chest, neck, and even through the eye during his fight with his brother thanks to his status as a member of the undead. Fortunately he's killed for good when the Hound drags them both off a ledge in the Red Keep to their deaths. Image Source: HBO