Metropolitan Police files show that detectives investigated 11 separate murders of women between April 1888 and February 1891, which became known on the docket as the Whitechapel Murders. Five of them, occurring between August and November 1888, are generally agreed to be the work of a single killer, Jack the Ripper, and are known collectively as the “canonical five.” The additional six may or may not have been victims of the same murderer.

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