Klosowski killed women

The argument

Although many different claims have been made about the psychological characteristics of Jack the Ripper, the one certainty of his character is that he must have been capable of committing the heinous act of murder. It is also a well-known fact that he exclusively killed women. In 1903, Seweryn Kłosowski was hanged for just that type of crime: he married and murdered three successive women. As he lived in Whitechapel during the same period of time in which the Ripper killings took place, it is likely that Klosowski was responsible for the Ripper's crimes.

Premises

Counter-arguments

The reasoning narrows the field barely at all. That the Ripper killed women and that Kłosowski killed women is a shared feature of a large proportion of murderers, and adding residence in Whitechapel — a district then holding some eighty thousand people — leaves a suspect pool of thousands. An argument of this form would identify any local man with a conviction for killing a woman. The method tells against the identification rather than for it. Kłosowski poisoned three wives with antimony over months, a concealed, domestic, patient method with a financial and controlling motive; the Whitechapel murders were sudden, public, physically violent attacks on strangers. Investigators and criminologists generally treat that gulf as close to decisive: poisoners and mutilators are rarely the same offender, because the two crimes satisfy different ends and require opposite temperaments. That Chief Inspector Abberline favoured the theory is a genuine point in its favour and is worth recording, but it was a hunch formed without the profiling framework later developed, and it did not persuade his contemporaries. The chronology is contested as well. Accounts of Kłosowski's arrival in London differ, and whether he was present for the 1888 murders is disputed rather than established — which is the one premise the argument would most need to be secure.

Rejecting the premises

[Rejecting P1] Being capable of murder and killing women describes a large class of offenders; as identifying criteria these narrow the field almost not at all. [Rejecting P2] Kłosowski's method — slow poisoning of wives within a household, for gain — is close to the opposite of sudden violent attacks on strangers in the street, and his presence in London in 1888 is disputed rather than established.