Teenage murderer Aaron Campbell is to feature in a TV crime documentuary based on children that murder. 

Now 17, Aaron Campbell was 16 when he took the life of six-year-old Alesha MacPhail. 

He was found guilty of abducting, raping and murdering the six-year-old child on the Isle of Bute as she was on holiday with her grandparents.

After carrying out the vile acts on the little girl and dumping her body on the grounds of a former hotel, he confessed to a friend he wanted to commit a murder.

READ MORE: Scottish Conservatives call for justice system transparency after Alesha MacPhail's killer Aaron Campbell has sentence cut

Glasgow Times:

Campbell will soon feature in 'Kids Who Kill:Evil Up Close' which is to be aired on the Crime+Investigation channel in March. 

Ahead of the airing, leading psychologist Emma Kenny told the film makers Campbell was "sadistic" and would always be a risk to others.

She said: "It's incomprehensible for any rational human being to imagine going into a room, seeing a beautiful, defenceless, vulnerable six-year-old and automatically thinking 'I want to murder her'.

"But that's the difference between a potential psychopath and a normal, functioning human being.

"He didn't know what he wanted for his future but what he wanted in his present was to carry out an ambition and that was to take a life. Alesha was not going to fight and she could gratify his needs.

"It's clear from the injuries that Alesha sustained that Campbell really enjoyed harming her.

"To become a sadistic, child molesting murderer is about as bad as a human can be and about as against nature as anyone can become.

"People like Campbell are rare but when they exist, they exist to destroy others."

It was revealed that after Campbell had murdered Alesha, he had taken a Snapchat of himself in the mirror, captioning "found the guy who done it". 

She added: "You have to ask yourself why he did that. I can't help but suspect that in that psychopathic psyche he had a level of pride in his work.

"He doesn't care about rules, he doesn't care about authority, he doesn't care about Alesha. What he cares about is enjoying what he did.

"His ultimate life goal was to kill somebody, he had said that to a friend. He did it exactly how he wanted. He lived his ghoulish dream."

It is understood that Campbell is known to play horror-video games, in particular one called 'Slender Man', which features abductions and killings of children in forestry areas - in a similar manner to Alesha's murder. 

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Berni Good, a cyberpsychologist, underlines in the documentuary that Campbell's obsession with the video game may have led him to murder.

She said: "The objective of this Slender Man is to abduct children within the video game.

"Aaron was very much immersed in this game, he spent a lot of his time playing it and I would suspect he almost fantasised about the outcome of taking the virtual world that he was playing in into the real world.

"What may have happened to Aaron is that he became desensitised to the violence and really then it became normal for him to act out violently because of what he had seen and what he had heard in these virtual worlds, these horror worlds.

"He was seeking validation and the fame that he was craving for."

Former Scotland Yard detective Peter Bleksley said: "I cannot get my head round what was going on inside Aaron Campbell's mind other than to say I think he's a monster.

"In my experience and in my opinion I don't think it will ever be safe to release Aaron Campbell from prison."

Trial judge Lord Matthews said Campbell had shown "a staggering lack of remorse" and that his account of the killing had been "coldblooded and horrific".

Argyll and Bute Child Protection Committee said Campbell had been known to the authorities and had been referred twice to the Youth Justice Service, however a review carried out after the murder concluded that it couldn't have been predicted by authorities. 

READ MORE: Alesha MacPhail killer Aaron Campbell was known to police before schoolgirl's murder

Kids Who Kill: Evil Up Close will be broadcast on the Crime+Investigation channel on March 30 at 9pm.