A NEW documentary examining harrowing details of how police caught double-murderer Christopher Halliwell will be broadcast on ITV tomorrow.

Television personality and real-life criminal defence barrister Judge Rinder will step out from behind the bench to take a closer look at the gripping case of Sian O’Callaghan, who disappeared after a night out with friends at the Suju nightclub in Old Town in March 2011.

The hour-long special will follow the multiple twists and turns in the case from the initial arrest to the court case, as well as Halliwell’s life-sentence imposed last year after he was found guilty of murdering Becky Godden.

The Judge Rinder documentary comes just weeks after a show aired in the USA recounting the 22-year-old’s last movements.

See No Evil: Watch Me Disappear, on the Investigation Discovery channel, revealed CCTV and Automatic Numberplate Recognition (ANPR) were key in apprehending Halliwell.

The documentary revealed suspicion swiftly fell on the taxi driver after his car was seen on CCTV repeatedly circling the area and pulling up beside Sian in High Street at 2.57am after she had left the nightclub.

A flash of light then obscured the footage and when the car pulled away, Sian had vanished.

In what would turn out to be a fundamental break in the case, CCTV showed a police car by chance driving past the car.

The police car had an ANPR camera, the records of which Wiltshire Police used to identify Halliwell’s green Toyota Avensis.

Halliwell would ultimately lead police to Sian’s body near the Uffington White Horse and to the remains of Becky Godden in Eastleach, Gloucestershire.

As well as testimonies from Sian’s mum Elaine Pickford, the new documentary on Wednesday will also include insights from police officers who worked on the case including Detective Superintendent Sean Memory from Wiltshire Police, who is currently off work through ill health.

Former Adver reporter Eve Buckland, who covered the second murder trial, is also interviewed.

Detective Superintendent Memory spearheaded the police operation that ultimately saw Halliwell found guilty of the 2003 murder of Becky.

After his conviction last year, the 53-year-old was told he would never be released from prison.

The Halliwell’s case is set to remain in the spotlight as former detective Steve Fulcher will see his memoir Catching A Serial Killer published on June 22.

The book is set to lift the lid on why Mr Fulcher decided to leave the force after being found guilty of gross misconduct by breaching the rules for the interviewing of suspects in regards to Christopher Halliwell.

Judge Robert Rinder’s initial specialism lay in international fraud and money laundering cases. But he has since focused on criminal law, something which led him to start the show which is now in its second series.

The show examines the police efforts that helped solve these crimes, as well as looking into miscarriages of justice.

Judge Rinder’s Crime Stories will be broadcast tomorrow at 2pm on ITV.