The 14-year-old girl who lured 13-year-old Olly Stephens to his death boasted “I’m so excited’ in a voice note, before the sickening crime was carried out.

Reading schoolboy Olly had been lured out to Bugs Bottom fields – just behind his home in Emming Green – by the girl and was then attacked by two 14-year-old boys.

The older of the boys began fighting Olly before the younger one stabbed him.

None of the trio can be named because of their ages.

Following his murder, Olly’s parents and the police quickly learned that the attack on Olly had been entirely planned using social media.

A sick voice note sent by the girl was highlighted by Monday night’s BBC Panorama, which has worked with Olly’s parents Amanda and Stuart to investigate the “violent and disturbing world their son had been exposed to online”.

The 14-year-old girl had been recruited by the two boys who knifed Olly to death.

His killers had communicated via Snapchat before his death, the Birmingham Mail reports.

She said in a message: “By the way, I’m setting up Olly tomorrow.”

She added: “[One of the boys] just wants me to set up so then he’s going to go and bang him and pattern him and s***.

“I’m so excited, you don’t understand.”

In one menacing warning, one of the boys tells Olly: “You’ve got poison in your heart fam. Olly you’re going to die tomorrow.”

Olly’s dad, Stuart, told Panorama: “They hunted him, tracked him and executed him through social media. Social media is not guilty of the murder, but it did nothing to protect him.

“Without it he’d still be here.” Stuart said: Olly had also been diagnosed with autism and his father said he would always ‘stick up for the underdog’.”

Speaking about the type of person Olly was, after his tragic murder, his dad Stuart said: “Olly trusted people too much, it was part of his make-up, it was part of his autism – it was why we loved him.

“He knew no sense of danger, he stood up for himself in a confrontation and was unable to back down, but was kind and loving.”

Some 200 police officers were involved in the investigation into Olly’s murder, which led to the two boys involved being found guilty of his murder during a trial at Reading Crown Court in September last year.

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The younger of the two boys was convicted of murder and sentenced to a minimum of 13 years in prison.

The older boy was convicted of murder and two counts of perverting the course of justice, for deleting apps from his phone and disposing of clothes from the attack. He received a minimum prison sentence of 12 years.