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Victor Lee, 17, was pulled from the water in Ladbroke Grove and died at the scene despite efforts to save him.
A post-mortem revealed he died from stab wounds.
Three youths have been charged with his murder and robbing him of his bicycle and rucksack on June 25.
On Wednesday, the trio entered not guilty pleas to the charges in a hearing at the Old Bailey before Judge Nigel Lickley.
They were remanded in custody ahead of a trial from May 7 next year.
Judge Lickley said a further case management hearing will take place on December 20.
Reporting by PA.
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