With extraordinary access to the multidisciplinary South Wales Police operation that brought the perpetrators to justice, Code Blue: Murder delves into the anatomy of two separate murder investigations, into the killings of Katherine Smith and of Jack Williams.

With extraordinary access to the multidisciplinary South Wales Police operation that brought the perpetrators to justice, Code Blue: Murder delves into the anatomy of two separate murder investigations, into the killings of Katherine Smith and of Jack Williams.

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This new documentary in ITV's Code Blue series explores the issue of one-punch killings after there were a reported 82 deaths of this type across the UK over the past five years.