THIS is the chilling moment a teenager leads his mum to a park before recording himself beating her to death in a horrifying four-hour attack. 

Tristan Roberts, 18, talked about killing his “terrified” mum Angela Shellis in online posts and recordings after he murdered her in a park in Wales.

Infrared CCTV footage showing Tristan Thomas Roberts guiding his mother, Angela Shellis, while she holds a cane.
He lead her towards a park under the pretence she would have her injuries tended to – before brutally murdering herCredit: Enterprise News and Pictures
 

Angela Shellis, a woman with light brown hair pulled back, wearing a pink shirt, looks directly at the camera.
Angela was a mother-of-two and worked as a teaching assistantCredit: WNS
 

Tristan Thomas Roberts, 18, is led to a security van in handcuffs after admitting to murdering his mother.
The court heard how Tristan had a hatred for women, and for his mum in particularCredit: DAILY POST WALES
A four-hour voice recording detailed how Roberts first attacked his mum in her bedroom, inflicting bruising to her face and strangulation injuries.

It was so chilling that the judge decided not to play it in court.

The mum had been kept prisoner in her room for hours as her son brandished a hammer.

He convinced her to leave the house under the pretence that she would have her injuries tended to at a local pub – but instead she was killed.

The teen, who spent hours every day on gaming platform Discord, later logged on and boasted about what he had done, Mold Crown Court heard.

Roberts was today jailed for life with a minimum term of 22 years and six months in prison.

He planned the killing for three weeks, while his horror attack lasted from 11pm until 3.30am – and he recorded it the entire time as a “trophy”.

On the day of the murder, he said in a voice recording: “This is Tristan Roberts.

“Tonight I’m going to be Alex and I’m going to murder my mother with a sledgehammer.”

The teen changed his online status to: “Tonight’s the night.”

The prosecutor told the court the teen “was in some way role playing”.

In one of his online posts he wrote: “TBH with you I think I nearly traumatised myself today by putting my shoes on at like midnight when she was sleeping and having the hammer in my hand.”

Another read: “She’s going to vanish off the earth. I’ve tried everything else. Now it’s time.”

The court heard after killing his mother, 45, with at least four heavy blows to the head, Roberts recorded himself saying: “Oh God that was terrifying…That felt so crazy.”

Thermal imaging of two individuals walking together at night.
CCTV footage showed the pair walking over a railway crossing, with Roberts carrying a rucksack containing the murder weaponCredit: North Wales Police
 

A Discord message from "Stiaeryy" that reads: "dont worry.. she is gonna just vanish off the earth i already tried everything else.. now its time"
He posted on Discord: ‘She’s going to vanish off the earth. I’ve tried everything else. Now it’s time’Credit: North Wales Police
 

A man with dark hair is seen from a bodycam, with a blurred police officer in the background.
Footage of the teen being arrested at the family homeCredit: North Wales Police
Roberts bought knives, axes and hammers after turning 18 – the legal age limit for these purchases – 10 days before the chilling attack in October last year.

In the weeks before the haunting murder, he’d posted disturbing content, openly talking about killing his mum – which he then recorded on a dictaphone.

AI platform DeepSeek suggested Roberts use a hammer rather than a knife to kill her, when he told it he was writing a book and asked for the best way to kill someone.

He also had a fascination with the US crime TV series Dexter and horror film American Psycho.

The court heard how he had a hatred for “girls” and for his mum in particular.

The mum-of-two was discovered with multiple blunt force injuries to the head in the seaside town of Prestatyn, North Wales, on October 24 last year.

There was a lengthy trail of blood along a nearby gravel path in the nature reserve.

A crutch, black gloves and black bloodied balaclava – which he forced his mum to wear – were discovered at the scene.

It later emerged Angela had needed a crutch because of a recent knee injury.

At first North Wales Police struggled to identify Angela after finding her at 8.30am – but at 1pm a worried relative phoned the force.

The family member was concerned after hearing reports that a woman’s body had been discovered.

Not long after, Roberts was arrested at the family home – where he lived with his mum – and charged with murder four days later.

When he was arrested, he was described as calm and compliant and he asked cops: “Is the body you found my mother?”

Evidence from a police investigation, including a sledgehammer, black gloves, and plastic bags.
The ‘murder’ bag cops recovered when they arrested RobertsCredit: WALES NEWS SERVICE
 

A white pole among overgrown green and brown bushes and shrubs.
Angela had needed a crutch because of a recent knee injuryCredit: North Wales Police
 

Tristan Roberts in a black and white image.
When he was arrested, he was described as calm and compliant and he asked cops: ‘Is the body you found my mother?’Credit: WNS
 

Mugshot of a young man with dark, shaggy hair, looking directly at the camera.
He was today jailed for life with a minimum term of 22 years and six months
Cops found Angela’s phone hidden under a suitcase in a wardrobe when they raided the home.

Family had tried to phone her and received messages back – thought to be Tristan posing as his mum to quell their concerns.

He told his older brother – who was away at university – that their mum was asleep in bed.

Ring doorbell footage showed the mum and son leaving their home on foot at 3.19am.

CCTV footage showed the pair walking over a railway crossing, with Roberts carrying a rucksack containing the murder weapon.

He returned home alone at 5.35am, and later left the house carrying a carrier bag thought to have contained bleach to clean the murder scene.

The teen had autism and ADHD and a previous offence as a youngster for possessing a bladed article.

Police have submitted an application for a safeguarding review.

Sentencing him at Mold Crown Court, Judge Rhys Rowlands said it was a “truly awful way to die” and Angela “cared for and worried about you”.

“She would have been in pain and terrified. She could be heard saying that you were hurting her and to call 999 and get help for her and let her go.

“You ignored her pleas and managed to leave the house on the pretext you would walk to town to get help and got her to wear a balaclava.”

The mum’s heartbroken family said: “She had so many amazing qualities, but one of the greatest was the way she devoted herself to her boys.

“She was a fantastic and fiercely supportive mum, the kind who never gave up, no matter how hard life became.

“She fought tirelessly for them, and her love for them was unbreakable, a source of strength that carried her and her boys through every challenge.

“Her kindness was genuine, her laughter infectious, and her presence brought warmth into every room. She had a way of making people feel seen, valued, and loved, and that is something rare and precious.

“Losing her has left a space that can never truly be filled. She will be missed every single day by so many people whose lives she touched.”

Aerial view of a dirt path with bloodstains, bordered by green grass and bushes.
There was a lengthy trail of blood along a nearby gravel path in the nature reserveCredit: North Wales Police
 

Angela Shellis.
Angela Shellis was murdered by her sonCredit: WNS
 

A police officer stands near police tape and police cars at a scene on Coniston Drive in Prestatyn.
Police at the scene on Coniston Drive, PrestatynCredit: Daily Post Wales