Author Russell Edwards claims to have uncovered the identity of Jack the Ripper as barber Aaron Kosminski with the help of DNA evidence taken from a blood-stained shawl believed to have belonged to Catherine Eddowes, one of the victims of the notorious 1888 killings. DNA taken from the shawl was compared to that of the descendants of Eddowes as well as those of Kosminski. Both sets of tests showed a match.
Kosminski was one of several suspects in the official investigation, but at the time there was not enough evidence to bring him to trial. Eddowes’ shawl, the DNA it contained, and the ability to match that DNA, it appears, was the evidence police were lacking at the time.
via The Daily Mail