Jack Ripper and case of missing DNA evidence

Donald Swanson's lengthy policing career saw him lead investigations into some of the worst crimes of the Victorian age ...
The most compelling suspect in recent years is Aaron Kosminski, a Polish immigrant who lived in Whitechapel during the time ...
The unknown killer, who earned the name Jack the Ripper, had brutally raped, mutilated and murdered five women, most of them ...
DNA analysis concluded that Aaron Kosminski, a Polish immigrant, was the notorious serial killer known as Jack the Ripper.