 Sutcliffe denied any knowledge and was not charged for this crime.It remained unsolved until 2011, when DNA evidence from the crime scene was matched to those of a deceased man named Christopher Smith (died 2008) who had been convicted of other offences, including attempted rape and manslaughter.On 17 June 1979, Humble sent a cassette to Assistant Chief Constable Oldfield, where he introduced himself only under the name "Jack" and claimed responsibility for the Ripper murders to that point.