Teenager Arrested Calmly for Mother's Hammer Murder
An 18-year-old in North Wales maintained a disconcerting composure during his arrest for the brutal murder of his mother, a crime he allegedly planned and executed after holding her captive.
Tristan Roberts, 18, was apprehended outside his residence in Prestatyn, North Wales, following the discovery of his mother, Angela Shellis, 45, deceased in the Morfa Nature Park. The arrest, captured on video, shows Roberts remaining remarkably calm as officers placed him in handcuffs.
Shellis, a teaching assistant, was found dead in undergrowth near a footpath on October last year. Investigations revealed that Roberts had beaten his mother to death with a hammer in a planned attack. According to reports, he held Shellis captive in her bedroom for four hours, recording the ordeal, before luring her into a secluded wooded area under the pretense of seeking help.
The documentary '999: What Happened Next' on Channel 4 details the events leading to Roberts's arrest and his subsequent sentencing. In March, he received a minimum sentence of 22 and a half years at Mold Crown Court.
During his arrest, Roberts inquired if the body found was his mother and appeared unfazed by the situation. Detective Constable Claire Owen, who worked on the case, noted his calm demeanor, suggesting it was unusual for an 18-year-old arrested for murder, and that he seemed to be in shock or not fully comprehending the gravity of the situation.
The police investigation began when a dog walker reported finding a woman's body and a trail of blood at 8:30 a.m. Officers discovered a crutch, balaclava, and gloves at the scene. Later that afternoon, a relative raised concerns about both Shellis and Roberts, who had barricaded himself inside their home. Police learned Shellis had been using a crutch due to a knee injury.
CCTV footage showed Roberts and Shellis leaving their home at 3:20 a.m., with Shellis carrying a crutch and Roberts a rucksack. This led investigators to suspect Roberts, although they maintained an open mind. Further footage revealed the pair heading towards the nature reserve, with Roberts returning home alone shortly after. He later left the house again, carrying a bag believed to contain cleaning supplies.
In the months preceding the murder, Roberts, who was diagnosed with autism and ADHD, reportedly posted online about his intent to kill and expressed hatred towards women. An AI tool allegedly advised him on the best murder weapon and methods for covering his tracks. Roberts's older brother had attempted to contact their mother on the day of the murder, receiving a reply from Roberts posing as his mother.
Shellis's sister, Sarah Gunther, described her as a mother who never gave up and emphasized the family's efforts to get Roberts the help he needed. A family liaison officer added that Shellis deeply loved her sons and made significant efforts to support Roberts, despite his deteriorating behavior.