Jury considers verdict in boy's stabbing murder trial

The jury has been sent out to consider its verdict in the trial of a teenager accused of stabbing a 14-year-old boy to death in a pre-arranged fight on the Isle of Man.

The 16-year-old, who cannot be named due to his age, denies murdering Christopher McBurnie in Ramsey on 29 May 2025.

Closing the prosecution's case on Wednesday, David Temkin KC said the stabbing had been "unlawful, deliberate and frenzied".

However, defence advocate Shiobhan Grey KC said he had acted in self defence after being punched in an attack which he thought it was going to carry on.

The jury was previously told the defendant and Christopher had traded insults on Snapchat on the evening of 28 May, which included threats to kill and calls for a fight, with the messages continuing into the following day.

Christopher had travelled to the northern town from his home in Castletown by bus on the afternoon of the stabbing, meeting two friends on the way, before walking to the defendant's home with five other young people.

Temkin said although the stabbing did not last more than a few seconds, the intent had been "to kill Christopher, or at the very least do him serious harm".

"This is not self-defence, it's not manslaughter, it's deliberate, unlawful killing."

He said while expert witnesses had agreed the defendant had autism, ADHD and had a social anxiety disorder, the conditions themselves did not form a defence.

"Nobody's saying he didn't know what he was doing," he said.

He argued while the defendant may have seemed quiet and shy when being questioned by his advocate, ring doorbell footage and voice notes in the group chat showed he was "an assertive, fluent and at that time aggressive young man".

Temkin said while he had been ridiculed and teased for not turning up to a fight in Douglas the year before with another boy, in 2025 he was "braver" and "determined to see it through".

It had been a "consensual getting together for the purpose of a fight" that had been called by the defendant who had repeatedly said "come [to] Ramsey", he said.

He asked the jury: "What do you think of that? Luring somebody to his house, to his door, for a fight and then claiming self defence."

He "knew perfectly well they were on their way and that is what he wanted" and while Christopher had been expecting a fist fight, the defendant was the only one who had a knife, he said.

Highlighting the four stone (28kg) weight difference between the two boys, Temkin said Christopher had "no chance" when a knife was added to the heavier boy's hand.

He said the defendant had a "rather large and convenient" gap in his memory of the stabbing itself, and had lied about his actions afterwards.

The defendant had come out his house purposefully and while he had been punched twice to the head, there had been no warning about the knife, which had been used immediately, he said.

His "intent to kill endured throughout those seconds", Temkin said.

"The only verdict is that he is guilty of murder."

Closing the case for the defence, Siobhan Grey KC said while the word tragedy was "terribly overused", the loss of Christopher's life was a "true tragedy for his family and friends".

However, she said the defendant was "not doing anything more than defending himself".

Grey said the defence was "not shying away" from the voice notes, which "go to the heart of the difference between the online world and the real world".

They had not been made face-to-face but rather at home in his bedroom when he was alone and in a "totally virtual world" and his autism made him more susceptible to disinhibition.

The repeated use of the word "verbalist" in his messages indicated he was "not thinking for one minute they were ever going to come to Ramsey", she said.

"He thought he was able to live in this Snapchat world."

It was only when he looked outside his kitchen window and saw the group of people, she said, that he "thought the messages were going to come true".

His low cognitive ability meant it was "much harder for him to think clearly, generate options and operate under pressure", creating real limitations that could not be ignored, she said.

The size comparison was a "superficial analysis" she said, adding: "He was an overweight fat kid who didn't come out of his bedroom. He didn't want to fight."

Christopher, however, was a fighter she said, who "big or small, he'll take you on".

"It was a fast-moving dynamic incident" and the defendant was frightened, she said, adding: "He'd been attacked and he thought it was going to carry on."

"With self-defence you don't have to wait until somebody does you serious harm to defend yourself," Grey said.

"It's not black and white, and life isn't, is it? It's multifaceted.

"We say he hasn't lied. He has been consistent throughout and when it was put to him that he wanted to kill Christopher, he said 'no'.

"We invite you to find [the defendant] not guilty of murder, not guilty of manslaughter."

The trial continues at Douglas Courthouse.

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