Jack the Ripper
Probably the most infamous serial killer in British history, Jack the Ripper stabbed and mutilated 5 prostitutes during the Autumn of 1888 in the Whitechapel area of London. He often removed the organs of his victims, leading police to believe he had anatomical knowledge.
His actual identity has been the subject of furious speculation, with some claiming he was a prominent doctor, that he was performing a Masonic ritual, or even that he was a member of the Royal Family.