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The case of the Yorkshire Ripper is re-examined by film-maker Liza Williams.
The trial and conviction of Peter Sutcliffe, the fallout from the investigation and the legacy for relatives of victims and survivors of his attacks.
How promising lines in the Yorkshire Ripper inquiry were overlooked as a hoax tape took centre stage, leaving the murderer free to kill again and again.
An exploration of the first three years of Britain's biggest criminal manhunt.