Chilling new images show the moment Olly Stephens' murderers calmly fled the scene after the schoolboy was stabbed to death in a park during lockdown. 

They have been shared as part of a Channel 4 documentary highlighting how Thames Valley Police used new digital technology to bring the much-loved 13-year-old's killers to justice. 

In one scene, a detective says how he found it quite upsetting listening to the voice notes from the perpetrators preparing to confront Olly.

He said: “It’s so personal, it becomes so real. In this way, how the young people were taking I found quite disturbing.

"They didn’t sound like 13 and 14-year-old teenagers and It sounded quite alien to me. It was like another world.”

Olly Stephens was 13-year’s-old when he was murdered on January 3, 2021 at Bugs Bottom in Emmer Green after he was lured to the field by a female friend. 

The entire attack had supposedly been planned on social media and triggered by a dispute in a social media chat group.

In the documentary, where detectives unpieced the case through digital forensics, CCTV footage was shown as the two murderers left the scene via one scooter.

Throughout the investigation 41 mobile phones were seized and analysed, 69,500 pages of evidence were worked through, 1,980 voice notes were transcribed and a sequence of events was created that contained 649 events.

The digital footprints left by suspects allowed detectives with specialist technology to uncover communications between two boys and a girl and how they attempted to cover their tracks.

Det Supt Andy Howard told the show: "We knew that the information we needed was going to come from the mobile phones and from the social media accounts."

Although forensic detectives were successful in their investigations, one officer stated that if this attack had occurred six months prior to the event, they would not have had the software to decode the messages and digital footprints.

Ollie’s Mum and Dad spoke during the documentary about their feelings after they witnessed the evidence during the trial that police discovered.

Mum, Amanda Stephens praised Thames Valley Police for their dedication, professionalism, care and kindness.

In a Facebook post about the documentary, Amanda said: "Our loss of Olly is forever, but with everyones love and support we feel able to do our much needed Ollys work, thank you all.”