Luton teenager who murdered mum and siblings spared of whole life order

The Court of Appeal has today ruled the sentence of a teenager who murdered his mother, brother, and sister in Luton will not be increased to a whole-life order.

Nicholas Prosper, 18 years old at the time and now aged 19, had admitted killing his mother, Juliana Falcon, 48, and siblings Giselle Prosper, 13, and Kyle Prosper, 16, at their family home in Luton, Bedfordshire, in the early hours of 13 September 2024.

He had also stabbed his brother more than 100 times, plotted a mass school shooting, and was later arrested after flagging down police and leading them to a concealed shotgun and 33 cartridges.

Prosper was sentenced to life imprisonment with a minimum term of 49 years at Luton Crown Court in March.

In April, the Solicitor General referred the sentence to the Court of Appeal, describing it as “unduly lenient”.

A spokesperson for the Attorney General’s Office said it believed Prosper “ought to have been given a whole-life order”.

In a ruling, the Lady Chief Justice Baroness Carr, sitting with Mr Justice Goss and Mr Justice Wall, said that Prosper's sentence was "itself a very severe sentence for a 19-year-old".

She said: "These were undoubtedly offences of the utmost gravity, with multiple features incorporating disturbing, recurrent themes around school shootings."

She continued: "Had the offender been 21 or over at the time of the offending, a whole-life order would undoubtedly have been made."

The court previously heard that Prosper had planned a mass shooting at his former primary school in Luton and had expressed a desire to commit “the biggest massacre of the 21st century”.

Mrs Justice Cheema-Grubb, who sentenced Prosper, said the teenager intended to commit a "murder spree with the sole purpose of glorifying the name of the perpetrator".

She added: "You wanted to cause the biggest massacre of the 21st century as there had not been one."

At the time of the attack, Prosper had just turned 18. He had legally purchased a shotgun and 100 cartridges from a firearms dealer the day before the murders, using a forged certificate. The court was told he paid £600—above the asking price—on the condition the seller included extra ammunition.

Before the attack, Prosper tested the shotgun by firing into a teddy bear in his bedroom.

He launched the fatal attack after being disturbed by his mother in the early hours. According to Detective Chief Inspector Sam Khanna, this interruption forced him to act sooner than he had planned.

"He's told us that his mother disturbed him in his sibling's bedroom, which meant that he had to act at that point and potentially bring forward his plans," said DCI Khanna.

"We believe that he would have looked to murder his family later in the day... but because his mother interrupted him... he knew that he wouldn't have the opportunity."

Prosper left the scene after the killings and was located by police nearby.

The investigation revealed extensive premeditation. Prosper had spent more than a year researching firearms, forging documents, and studying mass shootings. His internet history included searches related to St Joseph Catholic Primary School, his former school, and term-time schedules. He had also viewed violent online content and was known to have an interest in violent video games.

Documents found included maps of his flat and notes on his intended actions.

Prosecutor Timothy Cray KC told the court: "He had been preparing these killings for months. His planning was cold, deliberate and without sympathy or emotion towards the actual victims or potential victims."

Although a psychiatric assessment identified traits of autism, experts concluded this did not influence Prosper’s actions. He was not previously known to Prevent and had no criminal history.

Mrs Justice Cheema-Grubb noted that whole-life orders can now be given to offenders aged 18 to 20 only in exceptionally serious cases. While she said Prosper was “indisputably a very dangerous young man”, she found that a finite term would serve as a sufficiently severe penalty.

"This is not such an exceptionally serious case of the utmost gravity where the sentence of last resort must be imposed on an offender who was 18 at the time and is 19 today," she said.

As well as the murder sentences, Prosper also received concurrent jail terms of life with a minimum term of 18 years for possession of a firearm with intent to endanger life, three-and-a-half years for buying the gun and one year for possession of a kitchen knife, to run concurrently.

Whole-life orders are reserved for the most serious offences, with those handed the tariffs including Louis De Zoysa, who murdered Metropolitan Police Sergeant Matt Ratana in 2020, and Kyle Clifford, who murdered his ex-partner Louise Hunt, her sister Hannah Hunt and mother Carol Hunt last year.

Rules were changed in 2022 to allow younger defendants aged 18 to 20 to receive whole-life orders in exceptional circumstances, but no-one in that age bracket has received the sentence since then.

Lady Chief Justice Baroness Carr added that the sentencing judge, Mrs Justice Cheema-Grubb, was right to conclude that the "enhanced exceptionality test" of whether to pass a whole-life term on an 18-to-20-year-old was "not met on the facts".

She said: "Parliament chose to set what is already a very high threshold for a whole-life order for an adult, even higher for a young offender."

She concluded: "Appalling though these crimes were, we are not persuaded that anything less than a whole-life order was unduly lenient."

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