A boy has been jailed for at least 16 years for murdering 12-year-old Roberts Buncis in woodland in Lincolnshire last year.
The trial heard that Marcel Grzeszcz, 15, stabbed Roberts more than 70 times and that there was a neck wound “consistent with a decapitation attempt”.
The killing happened in Fishtoft, near Boston, on 12 December, just two days before Roberts’ birthday.
Grzeszcz had denied murder but admitted manslaughter.
He claimed Roberts had taken a knife to the scene and that he “lost control” when his friend tried to stab him.
However, the jury didn’t believe him and decided the murder was “motivated by anger”.
“When the two of you met up in the wooded area, I’m satisfied while the deceased was unarmed and unaware of what was to take place, you came armed with a large knife and with latex gloves intending at that time, at the very least, to cause him serious bodily harm,” said judge Mr Justice Jeremy Baker.
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Lincoln Crown Court previously heard that Grzeszcz had attacked Roberts because he believed he was “a snitch”.
The killer told the trial he had known Roberts for three or four months after they met in a town centre when a fight took place, but that neither were involved.