Police have identified the adolescent who passed away after being discovered with stab wounds in a canal.
On Sunday, Victor Lee, 17, of Ealing, was discovered in the water near Ladbroke Grove in West London.
Despite efforts to save him, he was pronounced dead at the spot after being retrieved from the canal.
He was found dead from his stab wounds on Wednesday, according to a post-mortem study.
Although formal identification has yet to take place, the Metropolitan Police said they are able to name Victor as the victim.
His family has been informed and is being supported by specially trained officers, the force said.
Three boys aged 14, 15 and 17 were arrested on Friday and remain in police custody.
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Police have renewed appeals for information and witnesses to the killing, which is understood to have happened on the Grand Union towpath under Scrubs Lane.x
Detective Chief Inspector Brian Howie from the Specialist Crime Command is leading the investigation and said: ‘We are continuing to provide Victor’s family with support during this traumatic time and our thoughts remain with them.
‘We made three arrests as part of our investigation into Victor’s murder.
‘However I still need to hear from anyone who has information about what happened last Sunday.
‘Were you in the area of the Grand Union Canal towpath near the Scrubs Lane bridge, or travelling on Scrubs Lane, between 5.15pm and 6.15pm?
‘Did you see a fight or hear anything that may assist with the investigation?
‘If you were driving in the area and have a dash cam, please review your footage and contact us or Crimestoppers on 0800 555 111.
‘My team will be in the vicinity of Scrubs Lane tomorrow, Sunday July 2, as part of a proactive appeal for information.’