On August 9, 2010, Gemma Hayter, a 27-year-old woman with a learning disability, was found stripped, stabbed and beaten to death on the bank of a disused railway track in Rugby, Warwickshire.The five people responsible for her death included Chantelle Booth, a young woman who Gemma had previously described as her "best friend".Gemma's family tell us how she had always struggled to make friends because her disability marked her out as different.Former Detective Superintendent David Swindle and psychologist Emma Kenny examine Gemma Hayter's child-like trust in people and look at chilling CCTV recording that show her being led to her death.