The worst murder, by far that I've ever heard of, was Junko Furuto who was tortured for at least 44 days after being kidnapped. the Torture was so intense and traumatic that her brain SHRUNK. If you look up the details on bestgore (where the story is uncensored and un-sugar coated), you might actually vomit. I'd say that the worst part was how easily her murderers got off. p!sses me off.