Jack the Ripper The nickname given to London’s most notorious serial killer, between 1888 and 1891. Because the perpetrator was never caught, the actual number killed is unknown and ranges from 5 to 11. The London Metropolitan Police Service called the deaths the Whitechapel murders. The victims were female prostitutes; five of the victims were unequivocally attributed to the Ripper (the “canonical five”), while the others may not have been. Many of the victims shared deep throat slashes, abdominal and genital-area mutilation, multiple stab wounds, removal of internal organs and facial mutilation, which police regarded as the Ripper's signature. Some theorists have speculated that he had some anatomic training, with several indications to a Francis Tumblety.