Casualty actress Mika Simmons, who lives on the tree-lined street, claimed the victim was a delivery driver but cops denied this when asked by the Sun Online.
She tweeted: "A young black man has just been stabbed to death outside my flat on Cathcart Road, in Chelsea.
"I’ve been told he was working as a delivery driver & refused to give some other youths some money."
"@SadiqKhan @theresa_may when are you going to help these children? #KnifeCrime #London”
London has been gripped by bloody violence with around 67 people murdered since the start of 2018.
The spike in violent crime meant the murder rate in London overtook New York for the first time.
It comes despite the mayor of London, Sadiq Khan, publishing a knife crime strategy last June and a number of other initiatives from local and central government.
Scotland Yard figures released this month show in the year to March there has been a 23% rise in gun crime and a 21% increase in knife crime.
Blade offences are at their highest level since 2011, according to the Office for National Statistics.
https://www.thesun.co.uk/news/6417289/c ... me-latest/