Cameron Hamilton, additionally 18, was pronounced useless on the scene after the altercation in The Square within the Dorset seaside resort on August 5.
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Thomas Betteridge, of Southsea, entered not responsible pleas at Bournemouth Crown Court to prices of homicide and possession of a kitchen knife in a public place.
Co-defendant Lennie Hansen, of Waterlooville, pleaded not responsible to helping an offender by altering sneakers with Betteridge, however responsible to possession of a kitchen knife.
Judge William Mousley KC adjourned the case for trial on January 29 2024, with a pre-trial evaluate to take place on December 18.
He informed the defendants: “You will be in court on December 18. That will be a pre-trial review before the trial, which is to start on January 29 next year.
“In the meantime, Thomas Betteridge, you will be remanded in custody, and you, Lennie Hansen, will be granted bail on the same conditions as currently in place.”
The household of Mr Hamilton, who was from Bournemouth, stated in a tribute launched by way of Dorset Police: “Cam is loved so much by his whole family. We ask that our privacy is respected at this devastating time. We have not lost our beautiful boy, he has been taken.
“We don’t want this to be what Cam is remembered for; we want him to be remembered for the funny, kind and wonderful person he is and always will be.”