Hitchcock’s The Lodger is loosely based on the story of Jack the Ripper. It seems possible that the ripper will continue to be the most famous serial killer of all time for the simplest of reasons – he was never caught.
How many stories can you tell about Ted Bundy or Jeffrey Dahmer? One. There is no rampant speculation about who they were or what they did. We all know.
You can make one movie about Ted Bundy and you’ve pretty much covered the story.
Jack the Ripper, on the other hand, could be anyone. He could be a time travelling alien! He could be professor Moriarty! He could be a lady! He could be Abraham Lincoln (the assassination was faked so he could emmigrate to England and fulfill his darkest desires)!