The term 'Murderous Alter Ego of Fiction' can be summarized as the character of Mr. Hyde from Robert Louis Stevenson's novel, 'Strange Case of Dr. Jekyll and Mr. Hyde'. Mr. Hyde is a dark and violent alter ego of the protagonist, Dr. Jekyll, who is created when Jekyll drinks a potion that unleashes his inner evil. Hyde is responsible for a number of murders throughout the novel, and is eventually killed by Jekyll in an attempt to rid himself of his monstrous other half.