Her autopsy attempted to do that. It tells what but not who, unfortunately. As for JBR, she never looked back. Many people often wonder whether mediums can get that kind of information from those who have been murdered. Usually it doesn't happen, although they will often tell WHAT happened when they were murdered, they won't often say WHO. At that point, frankly, they are free of the burdens of this mortal world and have no need to tell. Vengeance doesn't exist in a soul that has truly passed on, and there are always lessons to be learned by these unfortunate incidents. How the killer deals with what they've done, and how everyone in JBR's life deals with her murder and coverup and all that it involved is part of their own life's lessons and not JBR's any longer. It is up to those left behind to solve the puzzle.