However, this terrible tale does not end there, as some believe that Mary may have been the victim of a known serial killer and Jack the Ripper suspect, Frederick Bailey Deeming. Deeming was a renowned criminal and murderer who had murdered his first wife and four children and buried them under the floorboards of their house in Merseyside. Coincidentally, Deeming had just been released after serving time in Hull Jail under the name of Harry Lawson and was free and out in the streets at the time of the murder. According to local writer, historian and paranormal investigator Mike Covell, there were newspaper reports of the time that linked Deeming to the murder of Mary.

Deeming was a seafarer and is known to have travelled all over the country and across the world. He had murdered his family in Merseyside by slitting their throats, and the same fate befell the woman he married in Australia, whose murder finally had him brought to justice. Deeming was eventually caught and arrested in March 1892 in Perth, Western Australia. Among the various news reports about Deeming and his reign of terror worldwide, there were stories that he\'d spent time in Whitechapel during 1888 and had supposedly confessed to fellow prisoners during one period in prison that he was indeed Jack the Ripper. At his trial in Australia, the jury took little more than an hour to find him guilty, and Deeming was hanged on Monday, May 23rd, 1892.