A prostitute had a mans DNA on her? Strange.
This doesn't seem any more credible than any of the other thousand 'Jack the Ripper: Case Closed.' theories that come out every year. The guy they're accusing wasn't even a violent insane person, he only threatened 2 people on record, my favourite is James Kelly - arrested for stabbing his wife in the neck in 1883, escaped the asylum he was put in in 1888 a few months before the murders, and there's also some evidence to tie him to the Ripper-esque murders in New York and other American cities.
Surprised this Shawl still exists, I thought most of the evidence had been stolen or destroyed when the case was considered dead.