A chilling voice recording captured every horrifying second as an 18-year-old boy methodically ended his own mother’s life in a seaside town in North Wales. The four-hour nightmare unfolded in the family home and spilled into a nearby nature reserve under the cover of darkness on October 24 last year. Tristan Roberts didn’t just kill his mother Angela Shellis—he planned it for weeks, documented the entire attack as a twisted “trophy,” and then boasted about it online. What emerged in court was a story so disturbing that the judge refused to play the recording aloud, describing it as one of the most horrific cases he had ever presided over. Angela, a 45-year-old teaching assistant and devoted mother-of-two, died in a frenzy of strangulation and hammer blows after begging for mercy from the son she had fought so hard to protect.

Tristan Roberts lived with his mother in their modest home in Prestatyn, a quiet coastal community known for its sandy beaches and family-friendly vibe. On the surface, the household appeared ordinary. Angela was a single mum who had poured her life into raising her two boys. She worked tirelessly as a teaching assistant, supporting children with additional needs while managing her own challenges, including a recent knee injury that left her reliant on a crutch. Friends and family later described her as a woman of “unbreakable love,” someone who never gave up no matter how hard life became. She had devoted herself completely to her sons, fighting for them through every obstacle and filling their home with warmth, laughter, and genuine kindness. Her presence, they said, made people feel seen, valued, and loved—a rare and precious gift that would leave an irreplaceable void.

But behind closed doors, a storm had been brewing inside Tristan. At just 18, he had already been diagnosed with autism and ADHD. As a youngster he had a previous conviction for possessing a bladed article. He harbored a deep-seated hatred for women—and for his mother in particular. Hours every day were spent on the gaming and chat platform Discord, where he immersed himself in dark fantasies. He adopted the online persona “Alex” and role-played scenarios that blurred the line between fiction and deadly intent. Three weeks before the murder, Tristan began openly discussing his plans. He changed his Discord status to the ominous message: “Tonight’s the night.” In voice notes he declared, “This is Tristan Roberts. Tonight I’m going to be Alex and I’m going to murder my mother with a sledgehammer.”

The teenager’s online activity grew increasingly unhinged. He posted chilling messages such as, “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.” He even consulted an AI platform called DeepSeek, pretending he was writing a book and asking for the best way to kill someone. The AI reportedly suggested using a hammer rather than a knife. Tristan’s obsessions extended to the US crime series Dexter and the horror film American Psycho, feeding a fascination with calculated violence. Ten days after turning 18—and the legal age to buy certain weapons—he purchased knives, axes, and hammers. The tools of his planned attack were now in his hands.

The horror began around 11pm on that fateful October night. Tristan launched a prolonged assault on his mother in her own bedroom. The voice recording, which he made deliberately as a trophy, captured the four-hour ordeal in excruciating detail—from the initial strangulation and beating that left bruising on Angela’s face to the moments he kept her prisoner. She was terrified, in pain, and pleading for help. Court heard how she could be heard saying that he was hurting her and begging him to call 999. Instead, Tristan ignored every desperate cry. He forced her to wear a black balaclava and black gloves—items later found bloodied at the scene. Under the pretense that he would take her to a local pub for medical help for her injuries, he convinced her to leave the house with him at 3.19am.

Ring doorbell footage captured the pair walking out together. CCTV later showed them crossing a railway line, Tristan carrying a rucksack that contained the murder weapon. They made their way into a nearby nature reserve. There, in the darkness along a gravel path, the final act unfolded. Tristan delivered at least four heavy blows to his mother’s head with the sledgehammer. A lengthy trail of blood marked the spot where Angela Shellis collapsed and died from multiple blunt-force injuries. Her crutch lay abandoned nearby, a silent witness to her vulnerability. After the killing, Tristan recorded himself saying, “Oh God that was terrifying… That felt so crazy.” He then returned home alone at 5.35am, carrying a carrier bag believed to contain bleach to clean the murder scene. Later, he hid Angela’s phone under a suitcase in a wardrobe and began impersonating her in text messages to worried family members.

Tristan’s older brother, who was away at university, received messages claiming their mum was simply asleep in bed. The deception bought him time. North Wales Police discovered Angela’s body at 8.30am the next morning in the nature reserve. At first, officers struggled to identify her. It was only at 1pm when a concerned relative called the force after hearing reports of a woman’s body being found that the connection was made. Tristan was arrested at the family home shortly afterward. He remained eerily calm and compliant, even asking the officers: “Is the body you found my mother?” When police searched the house, they found Angela’s hidden phone and the disturbing digital trail he had left behind—posts, voice notes, and the full recording of the attack.

Four days later, Tristan was charged with murder. The case moved swiftly to Mold Crown Court, where the full horror was laid bare. Prosecutor details painted a picture of premeditation and cold detachment. The judge, Rhys Rowlands, listened to evidence of the prolonged suffering Angela endured—kept captive, beaten, strangled, and finally bludgeoned while pleading for her life. He described the crime as a “truly awful way to die,” noting that Angela had cared for and worried about her son despite everything. “She would have been in pain and terrified,” the judge said. “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.”

On sentencing day, Tristan Roberts received a life sentence with a minimum term of 22 years and six months. The courtroom fell silent as the judge delivered the punishment, underscoring the premeditated nature of the attack and the profound betrayal of a mother’s love. Angela’s heartbroken family issued a moving tribute that captured the depth of their loss. “She had so many amazing qualities, but one of the greatest was the way she devoted herself to her boys,” they said. “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.”

The case has left the tight-knit community of Prestatyn reeling. Neighbors who once saw Angela as the caring mum helping her son navigate life with autism and ADHD now struggle to reconcile that image with the brutality that unfolded. Police have submitted an application for a safeguarding review, seeking to examine whether more could have been done to protect Angela given Tristan’s known vulnerabilities and escalating online behavior. Mental health experts and campaigners have pointed to the dangers of unchecked access to violent content, AI tools that can provide lethal advice, and platforms like Discord where dark fantasies can fester in isolation.

This tragedy forces uncomfortable questions about the intersection of neurodivergence, online radicalization, and familial violence. Tristan’s diagnoses of autism and ADHD did not cause the murder, the court heard, but they formed part of a complex picture that included a documented hatred toward women and a history of concerning behavior. His previous offense for possessing a bladed article should have served as a warning. Yet the ease with which he accessed weapons once he turned 18, combined with his immersion in violent media and AI-assisted planning, created a perfect storm. The four-hour recording stands as a grim testament to how detached he had become—documenting his mother’s suffering not out of remorse but as a trophy to relive or share.

For Angela’s surviving son and extended family, the pain is unimaginable. The brother who received those fake messages about his mum being “asleep” must now live with the knowledge that the last words he heard from home were lies crafted by the very person who had just ended her life. Relatives who tried calling Angela and received responses they believed were from her were unknowingly communicating with her killer. The discovery of the body, the blood trail in the nature reserve, the discarded crutch—all of it paints a picture of a final journey that began with a mother trusting her son to help her and ended in betrayal so profound it defies comprehension.

In the weeks and months since the murder, Prestatyn has mourned quietly. The seaside town, usually filled with the sounds of waves and families enjoying the beach, now carries a heavier silence for those who knew Angela. Her work as a teaching assistant touched countless young lives, and colleagues have spoken of her patience and warmth. The nature reserve where her body was found, once a peaceful spot for walks, is now marked by tragedy in the collective memory of locals. Police officers who responded that morning—first struggling to identify the victim, then piecing together the horror when the relative called—carry the weight of what they witnessed.

The court process itself was harrowing. The decision not to play the voice recording was a small mercy for the family and jury, yet the descriptions alone were enough to shock everyone present. Prosecutors detailed how Tristan had convinced his mother to leave the house under false pretenses, how he had forced her to wear the balaclava to conceal her injuries from any passersby, and how he had continued the attack even after she begged for 999. The premeditation was undeniable: the weapon purchases, the AI queries, the Discord posts, the status change, the dictaphone recording—all pointed to a calculated act rather than a sudden loss of control.

Beyond the courtroom, this case highlights broader societal failures and challenges. How do we better support young people with neurodiverse conditions who also show signs of violent ideation? What safeguards are needed on platforms that allow anonymous role-playing and access to AI that can be weaponized? Calls for stricter age verification on weapon purchases and improved monitoring of online hate toward women have grown louder since the sentencing. Angela’s death is not just a family tragedy—it is a stark reminder of how quickly vulnerability can turn deadly when warning signs are missed or dismissed.

Angela Shellis’s legacy, however, endures in the tributes paid to her. She was the mum who never gave up. She was the woman whose laughter filled rooms and whose kindness touched strangers. Her love for her boys was described as a source of strength that carried them through challenges. Even in her final hours, she remained the caring mother, worried about her son even as he inflicted unimaginable pain. That devotion makes the betrayal all the more devastating. Her family’s words echo as both eulogy and warning: losing her has left a space that can never truly be filled.

For Tristan Roberts, the life sentence means decades behind bars before any possibility of release. At 18, he has effectively forfeited his future in exchange for an act of incomprehensible violence. Whether he feels remorse remains unknown; his calm demeanor during arrest and the trophy recording suggest a chilling detachment. The judge’s sentencing remarks underscored the horror: a mother who cared for her son, terrified and in pain, ignored as she pleaded for help.

As North Wales Police push forward with the safeguarding review, the hope is that lessons will be learned—to better protect vulnerable adults living with at-risk family members, to flag concerning online activity earlier, and to provide support systems that intervene before fantasy becomes fatal reality. Communities across the UK are watching, reflecting on their own families and the hidden struggles that can exist behind ordinary front doors.

The gravel path in the nature reserve where Angela’s blood once stained the ground has been cleaned, but the memory lingers. The family home in Prestatyn stands empty of the warmth she once brought. The crutch, gloves, and balaclava are evidence in a locked police storage room. And somewhere in a prison cell, Tristan Roberts lives with the consequences of the night he chose to become “Alex” and end the life of the woman who had given him everything.

This case will be studied by criminologists, discussed by mental health professionals, and remembered by everyone who knew Angela as a heartbreaking example of how love can be met with the ultimate betrayal. Her story demands attention not for sensationalism, but for the urgent conversations it forces about prevention, support, and the dangers lurking in unchecked digital spaces. Angela Shellis deserved better. She deserved the chance to watch her sons grow, to continue helping children as a teaching assistant, to keep filling rooms with her infectious laughter. Instead, her final moments were captured on a dictaphone by the son she loved so fiercely.

In the end, the seaside town of Prestatyn mourns a mother taken too soon, a family forever fractured, and a young man whose actions have left scars on an entire community. The voice recording may never be heard publicly, but its echoes will resonate through the justice system and beyond—serving as a grim warning that evil can hide in the most familiar of faces. Angela’s family continues to grieve, holding onto the memories of her devotion, her kindness, and the unbreakable love that defined her. They will miss her every single day, as will the many lives she touched with her warmth. Her light may have been extinguished in the darkest of ways, but the call for change it inspires can still illuminate the path toward safer homes, better safeguards, and a society more vigilant against the silent warnings that too often go unheard.