It was supposed to have been the definitive piece of scientific evidence that finally exposed the true identify of Jack the Ripper after he had brutally murdered at least five women on the streets of Whitechapel in the East End of London, over a 120 years ago.

A 23-year-old Polish immigrant barber called Aaron Kosminski was "definitely, categorically and absolutely" the man who carried out the atrocities in 1888, according to a detailed analysis of DNA extracted from a silk shawl allegedly found at the scene of one of his murders.

However, the scientist who carried out the DNA analysis has apparently made a fundamental error that fatally undermines his case against Kosminski – and once again throws open the debate over who the identity of the Ripper.

The scientist, Jari Louhelainen, is said to have made an "error of nomenclature" when using a DNA database to calculate the chances of a genetic match. If true, it would mean his calculations were wrong and that virtually anyone could have left the DNA that he insisted came from the Ripper's victim.

They say the error means no DNA connection can be made between Kosminski and Eddowes. Any suggestion therefore that the Ripper and Kosminski are the same person appears to be based on conjecture and supposition – as it has been ever since the police first identified Kosminksi as a possible suspect more than a century ago.

The latest flurry of interest in Kosminski, who died in a lunatic asylum, aged 53, stems from a book, Naming Jack the Ripper, published earlier this year, by Russell Edwards, a businessman who bought the shawl in 2007 on the understanding that it was the same piece of cloth allegedly found next to Eddowes.

Edwards commissioned Dr Louhelainen, a molecular biologist at Liverpool John Moores University, to carry out a forensic analysis of the shawl, including the extraction of any DNA samples that may be present within the cloth, which had been supposedly stored unwashed all this time by the family of the London policeman who had acquired the artefact.

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00:00 Intro
00:40 The Shawl
01:40 Suspects
02:52 Aaron Kosminksi
03:39 DNA
05:18 Nuclear Magnetic Resonance
06:01 Skeptics
07:01 Walter Sickert
07:32 Jill the Ripper

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