Chilling moment killer imitates firing gun as he prowls around family home before shooting dead his mum & siblings
THIS is the chilling moment a killer teen imitates firing a gun before he shot dead his mum and two siblings at his family home.
Nicholas Prosper filmed himself in the kitchen of the flat in Luton prowling around in a bright yellow bucket hat and jacket.
Smirking at the camera, the 18-year-old menacingly held up a piece of wood to imitate a large gun as he pretended to fire.
Prosper then pointed the “weapon” through an open door and uttered “bang” as though he firing at someone not in the frame.
A large bag seen on his back was used to pick up a real shotgun to kill his family just months later.
His “distinctive” outfit was also deliberately chosen so his attacks “might be remembered amongst the ranks of other notorious killers”.
The teen is being sentenced today for murdering his mum Juliana Prosper, 48, brother Kyle Prosper, 16, and sister Giselle Prosper, 13.
Luton Crown Court heard the family were blasted in the head at the home in Luton in September.
After slaughtering his family, the warped teen was stopped by police near his home after plotting a “cold, deliberate and without sympathy” massacre at his old primary school.
Officers discovered a loaded shotgun discovered in bushes nearby alongside more than 30 cartridges – one for each child Prosper planned to kill.
He had chillingly written “kill all” on a diagram that showed the early years classroom at St Joseph’s.
Police had swarmed the home at around 5.30am after neighbours heard “loud bangs” that sounded like shots being fired.
Officers discovered Juliana and two of her four children dead inside the flat.
Officers discovered Juliana and two of her four children dead inside the flat, having all been shot in the head.
Kyle had also been stabbed more than 100 times, while Giselle was found under a table as though she had been “trying to hide”.
The court heard Prosper originally planned to kill his family in their sleep then remain in the flat with their bodies until the primary school had filled up with children.
But his murderous plan was interrupted when his loved ones “realised something was terribly wrong and challenged him”.
This led to an “extended, violent struggle”, the prosecutor said.
After the horror, it emerged Prosper had a chilling internet history and had plotted the attack for over a year.
He had shared a number of vile videos leading up to the killings on social media where he defended paedophiles and necrophilia.
Prosper also poured over previous school shootings – including the 1999 Columbine High School massacre.
At the time, he was showing a “deep alienation from normal life and interest in the darkest sides of humanity”.
The court heard Prosper had undiagnosed autism spectrum disorder (ASD), but displayed “extreme lack of empathy with others and an extreme lack of remorse” that cannot be explained by ASD alone.
He accessed one site that showed videos of people’s final moments before they died but was banned after making pro-paedo comments.
The twisted teen also had an obsession with a child character called Clementine from The Walking Dead video game.
In one clip posted after the killings, he told the camera: “I am the chosen one; chosen by Clementine. I am guided as Christians are guided by Jesus Christ.”
He also threatened sister Giselle over her “incorrect choice” on the game.
Prosper said: “On June 30, my sister decided to make the incorrect choices on episode one of season one of The Walking Dead games, and for that her face will be mutilated further than necessary.”
Prosper's chilling internet searches
THE court was told Prosper was “continuously” on his phone between midnight and 4am on the morning of the triple murder.
He searched for “shotgun injuries to the neck” as well as other sadistic terms.
These included:
- What will happen on 13th September?
- Do you die if shot in the neck?
- Does sex with a corpse feel good
- Man shoots woman in the head at close range
- Woman raped and killed
- How lethal are neck gunshots
Prosper also searched for the murder of Sarah Everard.
Hours later, the monster fatally shot Giselle in the head along with his mum and brother.
It can now be revealed that Prosper had a sick desire to carry out Britain’s worst mass shooting by opening fire at a primary school.
The teen wanted to achieve “lasting notoriety” and to “imitate and even surpass” other mass killers around the world.
Prosecutor Timothy Cray KC said: “He understood his plans, if realised, would bring about the greatest number of deaths in a school or other mass shooting in the United Kingdom and possibly even in the United States of America.”
Prosper had written a chilling note that told how this would be “one of the biggest events ever”.
The court was told he was “not just play acting or fantasising” and that the murder of his family was “killing for the sake of killing”.
He managed to get his hands on the deadly weapon by creating a fake firearms licence and offered a gun enthusiast £600 for a shotgun and cartridges – £150 more than the asking price.
Prosecutors believe he planned to massacre kids as young as four at St Joseph’s Primary School then take his own life.
The plot was foiled by police, who had seen him acting suspiciously after shooting dead his family.
Officers discovered the 12-ball Nikko shotgun and 33 cartridges stashed in a bush nearby.
Det Ch Insp Sam Khanna, from Bedfordshire Police, said “fortunately Prosper was apprehended before he could cause any further harm”.
Despite his age, he became a member Gun Trader UK, an online marketplace for the sale of shotguns and rifles, in April 2024.
Prosper then began hatching his barbaric plan by researching how to fake a firearms certificate.
This plot was put into practice on September 12 – the day before the fatal shooting – when he picked up the shotgun in a car park.
The seller was “deceived” by his “high quality forgery” of a shotgun licence”, the court heard.
Footage showed the teen approaching the seller and shaking hands before taking hold of the weapon.
After bundling it into a huge holdall, Prosper was filmed inside a lift smirking as his murderous scheme came to fruition.
Prosper previously pleaded guilty to three counts of murder.
He also admitted a number of other offences – including possession of a shotgun with intent to endanger life, possession of a bladed article in a public place and purchasing or acquiring a shotgun without a certificate.
Paying tribute to Kyle, Giselle and Juliana, their devastated family said: “Julie was a strong, loving mother to her four beautiful children, who were her absolute world.
“In her spare time, she was a keen athlete and enjoyed raising money for charity – she was always putting others first.
“Kyle was a kind and funny young man who loved football and boxing.
“He was creative and thriving on TikTok, a big talent with massive potential.
“Kyle’s friends were his everything.
“Giselle was a beautiful soul and caring young girl; she liked to laugh lots and loved her family and big brothers.
“She was so loveable with an infectious smile.
“She was also an exceptional pupil at school and was loved dearly by her friends in Year 9.”