Code Blue: Murder

In the second programme, detectives are called out to an address in Swansea where the body of John Williams, known as Jack, has been found tied up with head injuries, apparently the victim of a brutal attack. The only potential motive officers can find is a substantial amount of cannabis scattered around the property - including what looks like a growing set-up in the attic.

Part one of two. Documentary revealing how detectives solved two murders - from the first `Code Blue' call to the crime scene, through to the convictions of the killers. In the first part, a 999 call from a distraught daughter launches a murder investigation to find the brutal killer of a beloved grandmother, June Fox-Roberts. With access to the South Wales Police's Major Crimes Unit, detectives try to identify the killer through CCTV footage in the hours before and after June's death.

Part two of two. Detectives have arrested 25-year-old art student Luke Deeley, who was previously reported missing, but is now refusing to talk. Officers still need to find the evidence to prove that he's the killer of beloved grandmother, June Fox-Roberts.

South Wales Police's Major Crimes Unit examine three cases, two killings and one assault, in which one punch had a devastating impact. They also explore the role of alcohol and violent culture, speaking to family members and friends left devastated by the deaths and injuries of their loved ones.