The murder of Pontypridd woman Tracey Woodford will be featured tonight on ITV Cymru Wales’ new series Crime Files.
Former butcher Christopher May was found guilty of murdering her in November 2015 and was given a life sentence in prison.
The programme reveals how police officers tracked May down in April 2015 and how they found parts of Ms Woodford's body in his flat.
May had dismembered his victim and had also hidden some body parts in drains around Pontypridd.
South Wales Police carried out an extensive search of Pontypridd town, including searching the River Taff and all drains around the Sardis Road rugby ground.
Police footage shows officers entering drains equipped with breathing apparatus and torches.
In one underground chamber, police identified Tracey Woodford’s head, which had been placed on a shelf.
Crime Files, presented by Andrea Byrne, also re-visits the case file of the Gower chorus girl Mamie Stewart.
Her body was found in a cave near Caswell Bay in 1961, 40 years after she had disappeared.
An inquest into her death concluded that she had been killed by her husband George Shotton in 1919. The programme investigates how police identified her body.
Crime Files is on tonight at 9pm on ITV Cymru Wales. If you missed last week’s programme you can catch up here.