Jack the Ripper was a left-handed surgeon from Essex, claims a Uruguayan mathematician.
Eduardo Cuitiño identifies Whitechapel Hospital doctor Stephen Herbert Appleford as the man who murdered five women during a reign of terror in 1888.
The 38-year-old, who is Professor of Statistics at the University ORT of Montevido, spent two years researching the killings and believes Appleford’s spree began following the death of his mother in 1881.
In a paper entitled Travelling Through Time To Trap Jack The Ripper, he claims Appleford was left-handed, like the killer, who cut the throats of his victims from right to left.
He says his conclusions come from analysis of the doctor’s handwriting.
Professor Cuitiño’s theory is just the latest in a long series of speculations. Further suspects have included an itinerant Polish labourer, painter Walter Sickert and the eminent Victorian doctor Sir William Gull.
Earlier this year author John Morris put forward his theory the murderer was actually a woman.
In his book, Jack The Ripper: The Hand Of A Woman, Morris names the key suspect as Lizzie Williams, of Royal gynaecologist Sir John Williams - later considered a suspect himself.
The Ripper victims were all prostitutes, murdered and mutilated in the foggy alleyways of Whitechapel. By the surgical nature of the wounds, the killer was assumed to have some surgical knowledge.
Morris's theory is supported by the findings of an Australian scientist who in 2006 used swabs from letters supposedly sent to police by the Ripper to build a partial DNA profile of the killer.
The results suggested that the person who murdered and mutilated at least five women from 1888 onwards may have been a woman.
Ian Findlay, a professor of molecular and forensic diagnostics, told the Australian Broadcasting Corporation that he had developed a profiling technique that could extract DNA from a single cell or strand of hair up to 160 years old. Conventional DNA sampling methods require at least 200 cells.
Dr Findlay, who is based in Brisbane, travelled to London, where the evidence from the still-unsolved murders is stored at the National Archive.
The material, which was kept by Scotland Yard until 1961, includes letters sent to police at the time, some of them signed "Jack the Ripper". Most are believed to be fakes, but a handful are thought to have been written by the killer.
Dr Findlay took swabs from the back of stamps and from the gum used to seal envelopes, and possible bloodstains. He took his haul back to Brisbane, where - concentrating on swabs from the so-called "Openshaw letter", the one believed most likely to be genuine - he extracted the DNA and then amplified the information to create a profile.
SEE ALSO: Was Jack The Ripper Really A Woman?
The results were "inconclusive" and not forensically reliable, but he did construct a partial profile and based on this analysis, he said, "it's possible the Ripper could be female".
Last year a retired British murder squad detective put together what he claims is an image of Jack The Ripper.
Trevor Marriott created an e-fit of the man he believes was the responsible for the Ripper murders, a German merchant named Carl Feigenbaum, for a BBC television program.
Feigenbaum was a suspect at the time of the murders, and reportedly told his lawyer that he had a "desire to kill and mutilate every woman who falls in my way." He was later convicted of killing his landlady in Manhattan, and died in the electric chair in New York's Sing Sing prison.
No photographs of Feigenbaum exist, so the e-fit (an electronic artist's impression) was based on eyewitness descriptions.
There are hundreds of suspects who have been investigated by sleuths through the years, but no-one has ever been able to conclusively prove the killer's identity.
This is not the first time that experts have attempted to use modern policing techniques to identify the Ripper. In 2006, Scotland Yard experts created this e-fit of what they thought the Ripper would look like.
WARNING: The gallery below contains some graphic content
The murder of Catherine Eddowes by Jack the Ripper. A sketch by Dr F Gordon Brown made on the spot to show the postition of the body and significant details.
The hand written note in the back of the book by Donald Swanson naming Life to the Crime Museum at New Scotland Yard. Picture Date: Thursday 13 July 2006. After Jack the Ripper's suspected true identity has revealed, more than 100 years after his gruesome series of murders. Chief Inspector Donald Swanson never caught the killer, who stalked Whitechapel, east London, in 1888. The Ripper claimed the lives of at least five women, all prostitutes, during his reign of terror.
Jack the Ripper An 1880 map of the East End of London where the murders occured.
Dutfield's Yard, off Berner Street (since renamed Henriques Street) in Whitechapel, the scene of the rippers third murder, that of Swedish-born prostitute Elizabeth "Long Liz" Stride.
Jack the Ripper A knife found at the scene of one of the murders.
13 Miller's Court, off Dorset Street, London Spitalfields, the site of the last and most terrible of Jack theRipper's murders, that of Mary Jane Kelly
The unrecognisable remains of the Ripper's last victim, Mary Jane Kelly.
Jack the Ripper Victim (Elizabeth Stride) From a sketch taken at the mortuary by Mr F W Foster 3:45 AM Sunday 30th September 1888
ack the Ripper A Metropoliotan Police sign in an attempt for information including a letter and postcard supposedly written by the murderer. 3rd October 1888
Mary Ann Nicholls, murdered in Bucks Row on 31st August 1888, seen in this mortuary photograph.
The back yard of the house at 29 Hanbury Street where the mutilated body of Annie Chapman was found on the morning of 8th September 1888.
A letter with the signature of an individual calling themselves 'Jack the Ripper' is seen during a press preview for the exhibition "Jack the Ripper and the East End" at the Museum in Docklands, London, Wednesday, May 14, 2008.
A person holds a knife allegedly used by Jack the Ripper during his East End London murders, which forms part of the Jack the Ripper exhibition in the Museum in Docklands opening tomorrow. Picture date: Wednesday May 14, 2008.