Dwarf hunter 1

A dwarf hunter is an unnamed minor character in the fifth season. He is played by guest star Jonathan Gunning and only appears in "The House of Black and White".

Season 5
He and his comrade hunt for Tyrion Lannister when a price is placed on his head. They mistake another dwarf for Tyrion and kill him, bring his head before Queen Cersei Lannister. She reveals that the head is not Tyrion's, and Ser Meryn Trant accuses them of trying to deceive their queen and offers to throw them in a cell. Cersei advises against it, as she does not wish to disuade the other hunters. Both men thank her for her mercy and she orders them to take the head with them, before Qyburn suggests that he keep the head as it may be useful for his work.

In the books
In the A Song of Ice and Fire novels, the dwarf killed is Oppo, one of the dwarves who provided entertainment at the Purple Wedding. The men who kill him are sailors from Westeros who kill him after coming across him in Volantis and mistaking him for Tyrion.