The Ripper killings stopped after Druitt's death

The argument

One of the most mysterious aspects of the Jack the Ripper case is that the Ripper killings abruptly ended after November of 1888, even though the murderer was never identified or arrested. If the Ripper himself had died around that time, however, his death would explain why the murders ceased. In December of 1888, Montague John Druitt committed suicide. Druitt was rumored to have suffered from hereditary mental health issues, and he chose to end his own life following his dismissal from a school in Blackheath, where he had worked as an assistant schoolmaster. His decomposing body was recovered from the River Thames on December 31st. The timing of Druitt's suicide, shortly after the last Ripper murder, provides an answer one of the most pressing questions about Jack the Ripper: why he stopped killing.

Premises

Counter-arguments

Critics argue that 'the murders stopped after Druitt died' is weak circumstantial reasoning that fits many suspects. Serial killers cease for numerous reasons unrelated to death — imprisonment for other offences, institutionalisation, illness, relocation or simply stopping — so a halt in killings around late 1888 does not point specifically to Druitt, and even the count of 'the last murder' is disputed, since some researchers attribute later killings to the Ripper, which would place murders after Druitt's suicide. They add that the timing is coincidental rather than evidential: no physical evidence, eyewitness identification or confession links Druitt to any of the crimes, and the case for him rests largely on a later, second-hand memorandum by a senior policeman whose reliability is contested. On this view the suicide's proximity to the killings is suggestive at most, and the same 'stopped after his death' logic has been used to nominate other suspects who died or were confined around the same period, so it cannot establish that Druitt was the Ripper.

Rejecting the premises

[Rejecting P2] Critics note serial killers stop for many reasons other than death — arrest, confinement, illness, relocation — so a cessation of murders does not specifically indicate the killer had died. [Rejecting P3] Druitt's suicide near the last canonical murder is coincidental; no physical evidence, identification or confession ties him to the crimes, and the case rests on a contested second-hand memorandum, so the timing does not establish his guilt.