Julie Hogg's killer was so confident he would get away with murder, he not only threatened his ex-girlfriend he would do to her 'what he did to Julie', he bragged about his crimes to a female prison officer.
William 'Billy' Dunlop - who was initially acquitted and freed after two juries failed to reach a verdict on the case - thought he was safe from prosecution due to an 800-year-old double jeopardy law.
Under the controversial piece of legislation, Dunlop could not be tried again, even though he had confessed to killing the 22-year-old pizza delivery driver.
However, Julie's mother Ann Ming swore she would not rest until she got justice for her daughter - and launched a 17-year campaign that would end up changing history.
The horror started in November 1989, when Dunlop - one of Julie's neighbours in Billingham, County Durham - sexually mutilated and strangled her to death.
