It is one of the world's greatest murder mysteries which has baffled
investigators for more than a century.
Jack the Ripper murdered at least five women, slashing their throats, removing some of their internal organs and leaving their mutilated bodied in Whitechapel's darkened alleyways
Russell Edwards，an expert in molecular biology，claims Aaron Kosminski, a 23 year-old Polish immigrant who ended up dying in an asylum, was "definitely, categorically and absolutely" the man behind the grisly killing spree in 1888 in London's East End.
Mr Edwards said a blood-stained shawl found by the body of Catherine Eddowes who was one of the Ripper's victims he bought in 2007 after an auction in Bury St Edmunds, Suffolk, held vital DNA evidence which led him to the killer. He used pioneering techniques to find DNA from her blood and that of the killer.