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A fourth person has been charged with murdering a 17-year-old girl who was stabbed to death in a park.
Jodie Chesney was attacked while playing music in a park with friends in Harold Hill in Romford, east London, on 1 March.
Police said the 17-year-old boy was also charged with possession of a stun gun and is due to appear at Barkingside Magistrates' Court on Monday.
Two men and a boy have already been charged with her murder.
Manuel Petrovic, 20, of Highfield Road in Romford, Svenson Ong-a-kwie, 19, of Hillfoot Road, in Romford, a 16-year-old boy and the 17-year-old boy, who cannot be named, are due to face trial at the Old Bailey in September.
The 17-year-old who was charged on Sunday had first been arrested on 10 March and initially released under investigation.
Another two people, a 50-year-old man and a 38-year-old woman, both from Dagenham, who were arrested on suspicion of assisting an offender, have been released under investigation.