A 19-year-old man is to appear in court charged with the murder of teenager Hani Abou El Kheir.
Hani, 16, was stabbed to death on the edge of Pimlico, one of London's most affluent neighbourhoods, last Sunday in an attack by a group of at least 10 people, police believe.
Ahmed Mikhaimar, of Aubrey Beardsley House, Vauxhall Bridge Road, will appear at Redbridge Magistrates' Court in north east London after being charged with his murder on Monday night.
Two other teenagers arrested on suspicion of Hani's murder have been released on bail, while four other people were bailed on Sunday night.
Two boys aged 16 and 17 arrested on suspicion of murder on Saturday were bailed to dates still to be fixed, while a man aged 48, a woman of 47 and two girls aged 16 and 17, who were arrested on Saturday on suspicion of assisting an offender, were bailed to a date in March, Scotland Yard said.
A 18-year-old man arrested on suspicion of murder on Saturday remains in custody.
A 20-year-old man was also arrested on suspicion of murder last Thursday and was bailed until late March.
Officers were called to reports of a youth stabbed in Lupus Street shortly before 7pm on January 27.
Hani, who lived on the nearby Churchill Gardens estate, was taken to King's College Hospital but died later.
A post-mortem examination gave the cause of death as multiple stab wounds.