William Stewart was one of the first to write about the possibility of Jill the Ripper in his book Jack the Ripper: A New Theory, published in 1939. In it, he attempted to narrow down not the identity of the killer but the class of person he might have been by asking four pertinant questions:

In 1939, long after Abberline’s speculations were left behind, author William Stewart elaborated upon the “Jill the Ripper” idea with his book Jack the Ripper: A New Theory. His Ripper was a midwife and clandestine abortionist who was betrayed to the law by another woman.

Aug 15, 2012 · One of history’s oldest unsolved mysteries is the identity of Jack the Ripper, the infamous serial killer who stalked and murdered at least five women in London’s East End in 1888.

Jul 9, 2021 · However, little more than circumstantial evidence suggests Mary Pearcey was Jill the Ripper. While she was certainly capable of murder, she also happened to be the best-known female killer active around the same time as the Whitechapel murders.

Mar 12, 2019 · The “Jill the Ripper” theory has a surprisingly legitimate origin story. Right after the murder of Mary Kelly — the victim with the missing heart — people started arguing about the time of her death.

4 days ago · With who killed JFK, what happened to Lord Lucan, and the identity of Jack the Ripper, also featuring on the list of mysteries.

The Ripper, widely thought to be male, killed at least five women in East London’s Whitechapel precinct during his reign of terror in 1888.

If Ripper Jill had been performing backstreet abortions, only to be betrayed by a fellow woman, she could seek out a perverted vengeance against female-kind more broadly.

Abberline asked Dutton, - 'Do you think it could be a case of Jack the Ripper, but Jill the Ripper. And was it possible that the killer dressed up in Kelly's clothes to disguise herself, and when …

William Stewart and Sir Arthur Conan Doyle advanced theories involving a female murderer dubbed “Jill the Ripper”. Supporters of this theory believe that the murderer worked, or posed, as a midwife, who could be seen with blood on her clothes without attracting suspicion and would be more easily trusted by the victims than a man.