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Sir Trevor McDonald reveals how a murder investigation unfolds.

The so-called ‘golden hour’ after a crime is reported is absolutely vital in terms of the success or failure of a police investigation.

This one-off, presented by Sir Trevor McDonald, reveals how, when 24-year-old Alice Ruggles was murdered in October 2016, decisions made by the homicide team swiftly brought her killer to justice.

They worked against the clock to provide CCTV footage, mobile phone records and forensic evidence to build a strong case.

Sir Trevor is seen visiting Alice’s grave with her parents Clive and Sue and, in a moving interview, asks them about their daughter’s life, and how they have coped since Alice died.