Much controversy arises when the victims are discussed because even to this day the number is unknown. The opinions range from 4 to 15, but there is a certain list of victims on which most researchers and parties involved in the case come to a consensus. Mary Nichols is at the top of that list, who has been found dead on August 31st, 1888 with her throat cut by a sharp blade.

In 2014, several media sources leaked results of an amateur detective who used genetic examination to establish that the real "Ripper" was a mad hairdresser of Polish origin working in London.