What did Doyle say about crime in relation to Jack the Ripper and mysteries?

Answer 1

Sir Arthur Conan Doyle and William Stewart advanced theories involving a female murderer dubbed "Jill the Ripper." Supporters of this theory believe that the murderer worked, or posed, as a midwife. She could be seen with bloody clothes without attracting unwanted attention and suspicion and would be more easily trusted by the victims than a man. A suspect suggested as fitting this profile is Mary Pearcey, who in October 1890, killed her lover's wife and child, though there is no indication she was ever a midwife. E. J. Wagner, in The Science of Sherlock Holmes, offers in passing another possible suspect, Constance Kent, who had served 20 years for the murder of her younger brother at the age of sixteen. There is some inconclusive DNA evidence taken from the letters sent to the police - this evidence does not rule out the possibility of the killer being a woman.