Originally posted by Abby Normal
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JtR's signature, according to Keppel: picquerism; overkill; completely and immediately incapacitating the victim, i.e. via multiple stab wounds, mutilations, near severing of the head; leaving the victims in open display, to degrade them and for shock value; posing; gradual escalation of violence, i.e. post mortem mutilations-focusing on the breasts, genetelia, abdomen and neck.
Torso killer: dismemberment and decapitation. Leaves body parts in unusual or public places, arguably for shock value. There is some evidence that, in the case of Liz Jackson, he progressed to harvesting organs, however as I believe Dr Bond pointed out, they were not the same body parts that JtR harvested: in Jackson's case both the uterus and kidneys were found, although I believe the heart and lungs were missing. Moreover, it's possible body parts were lost during the disposal process, or disposed of elsewhere and not found. There were mutilations in the torso cases, however Drs Hebbert and Phillips seemed to believe this occurred as a consequence of disposing of or dismembering the body.
Of course, signatures can evolve or become more elaborate, but I am not aware of a single example of where a serial killer has alternated between two different signatures. It is also worth noting that "signature characteristics remain stable and reflect the nature of offender." (Keppel, 2005). It is therefore unlikely that there would be evidence of a change in signature characteristics simply because the killer had temporarily lost access to his dismemberment site.
A perfect example of the very different signatures and MOs of JtR and the Torso killer, is the last Torso case, the Pinchin Street Torso. Thus, firstly, unlike the C5 victims, the Pinchin Street Torso was dismembered and decapitated.
Secondly, in the Pinchin Street case a dump site was used: the victim was not killed close to where the body was found. Unlike JtR's murders, where the body of the victim was simply left where the murder took place.
Thirdly, as Donald Swanson pointed out there was no mutilation of the genitals, unlike the Whitechapel murders, which is significant because, as Keppel pointed out, this seemed to form part of JtR's signature.
Fourthly, all of the C5 victims without exception were murdered by having their throat cut. However, that doesn't appear to be the case with the Pinchin Torso: thus Keppel (2005), citing Evans and Skinner (2000), "The trunk was full of blood indicating that a hemorrhage had not occurred. This also indicated the throat could not have been cut." Interestingly, the earlier Battersea Torso victim (1873) was possibly killed by being struck on the head with a blunt instrument: in that case the jury returned a verdict of wilful murder by person or persons unknown.
There was evidence of mutilation in the Pinchin Street case, however Dr Phillips' believed "they were made for the purpose of disposing of the body." There was also a gash on the abdomen, "but this appeared to have been inflicted when the dismemberment had taken place." (Evans and Rumbellow, 2006)
There has been some talk of "experts" on this thread recently. However, I am not aware of a single respected Ripperology author who has ever attempted to connect any of the torso crimes to those of JtR. In fact, the only author who has attempted to do so is Michael Gordon, who attributed all of the murders to George Chapman! Mind you, not sure if he qualifies as an expert!
Perhaps I should finish by quoting the wise words of two undoubted experts, Stewart Evans and Donald Rumbellow: "On Tuesday 10 September 1889 unidentified female remains were found under a railway arch. This case bore no resemblance to a Ripper killing. On the contrary, it appeared that the murderer had cut up a body to prevent its identification and then dumped it away from the scene of his crime." (Evans and Rumbellow, 2006)
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