A major crime review team found new DNA evidence to convict serial rapist Donald Robertson of Shani Warren's murder 35 years after her death - but her cold case could have potentially been solved much sooner
Dark Waters: The Murder of Shani Warren, airing at 9pm on Channel 5 tonight, explores the case of Shani Warren s 1987 murder in Taplow Lake by serial rapist Donald Robertson, 67.
Donald Robertson was locked up for life after preying on girls as young as 11 threatening to knife, strangle or bottle them in a series of terrifying sex attacks during the 1980s.