4. Oberyn Martell
This is truly one of the most dreadful deaths shown. The royal prince with beauty, pride and sex-appeal, Oberyn Martell is last seen with a strange expression on his face as he decides to become Tyrion’s champion in a trial by combat. He ultimately falls to the hands of Ser Gregor Clegane, who gauges out his eyes, smashes his teeth, and scrambles his brains in a brutal scene in which the killer also confesses to killing Aegon and Elia.