Question: who kills the hound in game of thrones

title: Sandor Clegane
text: With the rest of House Stark believed dead and the Riverlands now under the rule of House Frey , Clegane decides to ransom Arya to her aunt Lysa Arryn in the Vale . During their journey , Arya reveals to Clegane that she has not forgiven him for killing Mycah and has vowed to kill him . The duo arrive in the Vale to find that Lysa has ostensibly committed suicide . Returning from the Bloody Gate , they encounter Brienne of Tarth , sworn sword to Arya 's mother Catelyn , who had promised to take the Stark children to safety . When Arya refuses to go with Brienne , she and Clegane engage in a brawl that culminates in her throwing Clegane off a cliff , gravely wounding him . Though he begs Arya to kill him , she instead leaves him to die . Season