Jai Sewell, also known as Jay Hughes, was stabbed once in the heart on the streets of Bellingham, South East London last Thursday.
In sickening CCTV, the teen can be seen standing with a friend before masked gang members run towards them.
As his pal runs in a desperate bid to escape, an individual in a hoodie – armed with a huge knife – lunges towards Jai.
Sun Online has chosen to run an edited version of the chilling footage to show the terrifying reality of London's knife crime epidemic
In the unedited footage the attacker can be seen plunging his blade into the schoolboy's chest.
The entire attack unfolded in just a few seconds.
The teen is just one of five people killed in six days as knife violence spirals out of control in Lawless London.
The footage was shared on social media, with the message: "I don’t normally push this topic but this is something that the authorities must see & act upon as soon as possible.
"It’s already out of control & emergency meetings must be done ASAP. We need to stop this."
Jai was rushed to hospital but died just after 8pm.
A post-mortem examination was held at Greenwich mortuary on Sunday, 4 November and his cause of death was given as a single stab wound to the heart.
The community has been left horrified after the week of bloody violence in London this week.
John O, 16, Rocky Djelal, 38, Jai Sewell, 15, Malcolm Mide-Madariola, 17, and Ayodeji Habeeb Azeez, 22, were all killed in the six days from October 31 to November 5.
In figures compiled by Anti-Knife UK, it has emerged that this marked the 250th fatal stabbing across the UK so far this year.
This makes the figure bigger than both 2015 and 2016 combined – and the fifth knife murder in London in just six days.
The number of homicides in the capital so far this year to 117.
Police released a photograph of Jai earlier this week as part of their appeal to find answers.
Detective Chief Inspector Chris Soole, of the Met's Homicide and Major Crime Command, said: "I'm hoping the release of Jay's image will help to jog the memory of those in and around the Randlesdown road area in Bellingham on the night of his murder.
"My team continues to work around the clock to apprehend those responsible for this callous attack, which cost a young boy his life.
"I'd urge anyone with information, no matter how insignificant they believe it is, to do the right thing and get in contact with us as soon as possible.
“I appreciate that there may be a reluctance to speak with police but I can assure you that we will treat all information given to our Major Incident Room in the strictest of confidence.
"Alternatively, you could speak anonymously to Crimestoppers."
Anyone with information that may assist the investigation is asked to call police on 0208 345 3734.
To remain anonymous, call Crimestoppers anonymously on 0800 555 111.
You can also tweet police via @MetCC
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