Four 17-year-old boys have been locked up for the 'ferocious' killing of another teenager who gatecrashed a girl's 16th Airbnb birthday party.
Lewis Blackman, 19, known as 'Dotty', was part of a group of 10 men who turned up uninvited at a flat party in Kensington, southwest London, last year.
Mr Blackman was then stabbed 13 times after being chased from the flat in the early hours of February 18 last year.
Following trials at the Old Bailey, three youths, who were 16 at the time, were found guilty of murder and a fourth of manslaughter.
Lewis Blackman (pictured), 19, known as 'Dotty', was stabbed 13 times after he was chased from a birthday party in Kensington, London, in the early hours of February 18 last year
Demario Williams (left) was said to have played a 'pivotal role' in the murder and was sentenced to at least 20 years while Paul Glasgow (right) was handed a minimum term of 18 years
Lawrence Nkunku-Linongi (left), was handed a minimum term of 18 years while Thierry Edusei (right), was handed 11 years for manslaughter
Judge Anthony Leonard QC lifted reporting restrictions on the defendant's identities as he sentenced them.
Demario Williams, who played a 'pivotal role' in the murder, was detained at Her Majesty's pleasure for at least 20 years.
Lawrence Nkunku-Linongi, who had a previous conviction for carrying a 'Rambo-style knife', and Paul Glasgow, were handed minimum terms of 18 years.
And Thierry Edusei, who had been on bail on suspicion of violent offences at the time, was handed 11 years for manslaughter.
Judge Leonard told them: 'Whilst it has to be accepted Lewis Blackman was himself acting aggressively that night, he did not deserve to die.
'His mother described him as a fun, popular and compassionate