In the case of the Black Dahlia, the way her body was found was extremely spooky. Her body was not only cut in half but also had strange markings and was posed in a very disturbing way. It was found in a vacant lot, and the brutality of the murder and the way the body was left was just bone - chilling.
In the JonBenét Ramsey case, the ransom note was a spooky detail. It was long and seemed to be written in a way that was almost like a script for a movie. It had odd language and seemed to be written by someone trying to mislead the police. Also, the fact that she was found in her own home with so many unanswered questions about who could have done this to a young child is very spooky.
The Axeman of New Orleans left a really spooky message. He said that he would spare the lives of those who played jazz music in their homes on a certain night. It's a very odd and spooky detail that added to the mystery and fear in the city at that time. People were actually playing jazz all night just to be safe from this axe - wielding killer.