Originally posted by John Wheat
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Chapman being a serial killer wasn't Abberline's only reason for suspecting him. His other reasons included Chapman's medical knowledge, his moving to the immediate area of the murders shortly before they began and moving away shortly after they ended, and that he thought Chapman was a close match to the witness descriptions.
Serial killers do change their M.O., it's just a question of whether the change from strangler/throat cutter to poisoner is too extreme a change. We see the question of how much of a change in the M.O. is too much of a change to be believable arise on other occasions in this case. Must Chapman have been killed before dawn when all of the Ripper's other victims were killed before dawn? Can we assume that BS man can't have been the Ripper because he assaulted a woman in front of 2 witnesses, something that the ripper never did on any other occasion? MJK is considered a Ripper victim by most people even though all other Ripper victims were killed outside, and none mutilated to the extent that MJK was.
It's arguable that going from strangulation/throat cutting to poisoning is a more extreme change than any of the examples that I gave above. If Chapman committed some of the Whitechapel murders and later poisoned, the 2 closest parallels to that that I know of are Belle Gunness and Carl Eugene Watts. Gunness seems to have used arson, poisoning, and bludgeoning as means of murder. Watts used bludgeoning, strangulation, stabbing, and drowning. If anyone knows of a closer parallel than these two, I'd be interested to hear it.
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