In 1992 Rachel Nickell was murdered in broad daylight on Wimbledon Common in front of her two year old son.  This is the story, made for ITV1's Real Crime strand, of how it took 16 years to convict her killer, after an innocent man wrongly suspected of the crime was persecuted. It took a revolution in DNA technology for the police eventually to bring her real killer, Robert Napper, to justice.

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