6. The Poisoner: George Chapman
Chapman is a serial killer. That much is known to the police, who tried and convicted him for the murder of several women by poison. At the trial, former Inspector Frederick Abberline, who had been one of the policemen in charge of the Ripper case, said to a colleague that they had caught Jack the Ripper at last (or words to that effect). Chapman was born Seviarno Klowoski and at the time of the murders he certainly was around Whitechapel, and there are many who claim that the idea of a Polish Jew being the Ripper murderer was more substantial than mere xenophobia. However, while Chapman is a known killer, his methodology is vastly different. The technique of poisoning wealthy women and mutilating prostitutes don't exactly correlate. Furthermore, while Chapman was in Whitechapel at the time of the murders, he was only just settled and very probably would not have had the extensive knowledge of both the prostitutes as well as the streets to enact these horrible acts.