Cleavage Jack severed at least five prostitutes at the Whitechapel, East End of London, London, about two months between August 31 and November 9, 1888, and committed murder, but was arrested. Didn't arrive. It is said to be the originator of theater-type crimes, such as sending a signed notice of crimes to a newspaper company. From the mentally ill patients defined by those days to the people involved in the royal family, their identity has been repeatedly discussed until now, but the criminal is unknown even more than a century later.
Ripper Jack chose the prostitute for murder. Violations were always carried out in or near public places, where the victim was scratched with a sharp knife like a scalpel and then had a specific organ removed. From such facts, it is said that he has anatomical knowledge, and the theory that Jack's profession is a doctor is considered strong. However, in recent years, the theory that it is a butcher has become more prominent due to the latest profiling.
Even during such an incident, there was evidence that the victim women were welcoming the criminals without caution, and there was even a theory that the crime was committed by women. In addition, there are various objections such as the crime continued for more than a year.
In this case, "Jack" does not mean the name of a specific person, but rather the name of a man whose name is not fixed in the English-speaking world, such as "Unnamed Gonbei" in Japan.