A 16-year-old boy has been convicted of murder following a trial at the Old Bailey.
The teenager, who cannot be named due to his age, was found guilty of murdering 17-year-old Ayub Hassan on Thursday, 7 March.
He will be sentenced at the same court on Friday, 27 September.
The court heard that police were called at 14:15hrs on Thursday, 7 March to reports of a stabbing just off Lanfrey Place, Kensington.
Officers attended and found Ayub with a stab wound to his chest. Despite the efforts of the emergency services, he was sadly pronounced dead in hospital just two hours later.
A post-mortem examination gave the cause of death as a single stab wound to the heart.
Homicide detectives from Specialist Crime launched a murder investigation and gathered CCTV from the scene which captured the incident and the moments leading up to it.
Footage played in court showed a group of males, including Ayub and the defendant, socialising in an alleyway leading into Lanfrey Place, at the rear of Marzel House.
The 16-year-old - who was 15 at the time of the incident - is seen approaching Ayub and appearing to argue with him, before stabbing him once in the chest.
Following the attack, the group moved onto Lanfrey Place where Ayub collapsed backwards onto the ground.
Despite being helped across the road, he fell for a second time and was assisted by members of the public, including an off-duty nurse.
Analysis of the CCTV led officers to identify the defendant, who was also captured cycling away from the scene following the attack.
He was arrested at an address in Southall the following day, where clothing matching that worn in the footage was seized.
A phone recovered from him at the time of arrest was also found to have connected with a mast close to the scene of the stabbing on the afternoon of the murder.
Detective Inspector Steve Keogh, who led the investigation, said: “The defendant in this case came armed to cause significant violence and attacked Ayub when he was completely defenceless.
“We may never know the real reason behind this fatal stabbing which left Ayub dying in the street as the defendant has failed to own up to his actions.
“Ayub’s death has left his family completely devastated and we hope this conviction brings them some kind of closure.
“I want to pay particular tribute to those who came to Ayub’s assistance, particularly the nurse who did all she could to help him before further emergency services arrived. Sadly, despite the considerable efforts of many people, he could not be saved.”
+Do you know about someone who is carrying a knife? If you have information that could help keep your community safe, but don’t want to speak to police, please contact the independent charity Crimestoppers on 0800 555 111. They do not ask your name and cannot trace your call or I.P address.
Any young people who have information about violence or knife crime can visit www.fearless.org where they can pass on information anonymously – your I.P address will not be traced. Fearless is part of the Crimestoppers charity, and is also independent of the police.