and Annie Chapman) had occurred in the districts of Whitechapel and Spitalfields—both of which had been initially caused by knife wounds to the throat—within the previous month, Stride's murder was added to the Whitechapel murders investigation, and was widely believed to have been perpetrated by the same killer. However, some commentators on the case conclude that Stride's murder was unconnected to the other canonical murders This opinion is upon the basis that the body had not been subjected to any mutilation and that this murder was the only murder ascribed to Jack the Ripper to occur south of Whitechapel Road. Furthermore, it is believed that the blade used to cause the wound to Stride's neck may have been shorter and of a different design than that used to murder and subsequently mutilate the other four canonical murder victims. Most experts, however, consider the similarities in this case distinctive enough to connect Stride's murder with the two earlier Ripper murders, in addition to the murder of Catherine Eddowes later that same night. The murder of Stride is regarded as one of the canonical Ripper killings due to numerous factors, including the general physical and lifestyle characteristics of the victim, the day of the week she had been murdered, the time of death, the murder location, and the method of her murder. It is suspected that when Stride's murderer heard Diemschutz's horse and two-wheeled cart approaching or entering Dutfield's Yard, he ceased his attack. The killer may have still been inside Dutfield's Yard upon Diemschutz's approach, as the gate on Berner Street was the only point of entry. He may have escaped when Diemschutz entered the International Working Men's Educational Club. Less than one hour later, Catherine Eddowes was murdered in Mitre Square, and both Stride and Eddowes had lived in Flower and Dean Street. The deaths of Eddowes and Stride sent London into a renewed state of general panic, as this was the first occasion in which two murders ascribed to the Ripper had occurred in one night. Correspondence On 1 October, a postcard dubbed the "Saucy Jacky" postcard and also signed "Jack the Ripper", was received by the Central News Agency. This letter claimed responsibility for the murders of both Stride and Eddowes, and described the killing of the two women as a "double event"; a designation which has endured. It has been argued that this postcard was mailed before