Ripperology is defined as being the study of the infamous
serial killer Jack the Ripper. Though the term has not made its way into the mainstream, those who study the case, or are simply enthusiasts are referred to as 'Ripperologists'.
This does not simply refer to finding out who the killer was, but who all of
the victims were, along with various "evidence" such as the highly debated credibility of the Ripper letters.