The first definite victim of the killer who became known as Jack the Ripper was Mary Nichols, who was murdered on 31st August 1888. She is the first of what are often referred to as the five “canonical” victims, all of whom were murdered between August 31st and November 9th 1888.
https://www.jack-the-ripper.org/images/victims-of-jack-the-ripper.htm

