TV documentary analyses Portsmouth teenager Ben Moynihan who stabbed three women

Police searcing woods in Hilsea Lines in Portsmouth where a woman was stabbed

Ben Moynihan was jailed for 21 years after he stabbed three women in Cosham in the summer of 2014.

He was 17 when he carried out the attacks and 18 when convicted of three charges of attempted murder.

Now filmmakers are to broadcast a documentary on CBS Reality this Sunday about the attacks.

A psychologist and two criminologists have analysed the case for filmmakers Peninsula TV for the third episode of Teens Who Kill.

The show, to be screened at 10pm, will featured interviews with The News crime and court reporter Ben Fishwick and city councillors

Ward member for Cosham Lee Mason and member for Hilsea Scott Harris have been interviewed.

Deanna Cutler, a former classmate of Moynihan, is also set to say she feels the teenager was harshly punished by a judge.

A spokeswoman for the show said: ‘Deanna reveals her guilt and feels he has been overly punished.

‘The episode also reveals post-trial that Ben was on the autistic spectrum disorder.

‘Teachers and family probably just saw him as an anxious young man and hadn’t diagnosed him or recognised his condition and he developed obsessions with notorious serial killers Ian Brady and Denis Nilsen.

‘His poor sense of self and other issues is believed by the programme’s experts to have impaired his emotional development.’

During the trial, a jury at Winchester Crown Court saw a video Moynihan recorded in his bedroom.

In it, he said: ‘I’m still a virgin, everyone is losing it before me, which is why you’re my chosen target.’

Waving a knife at the camera and then holding a lit cigarette lighter, he said: ‘Shall I stab you in the neck or in the heart, shall I slash your throat or should I just cigarette lighter you?’

Moynihan, formerly of The Ridings, Hilsea, also kept a ‘diary of evil’, which prosecutor Kerry Maylin said detailed the attacks.

The teenager also left two letters for police, calling himself ‘the unhappy geezer’ with a logo from the video game Tomb Raider in one and included a photograph of himself in another.

He had always denied attempted murder and had admitted wounding.

After being sentenced, he launched a doomed appeal to reduce the jail term.