An 18-year-old man is the fifth person to be charged with the murder of schoolboy Paul Erhahon in east London.
Paul Erhahon was stabbed in the heart
Paul, 14, was stabbed in the heart and died near his home in Leytonstone on 6 April. A friend of his was also stabbed in the attack.
Theo Diah, of Anglian Road, Leytonstone, has been charged with his murder and the attempted murder and grievous bodily harm of a 15-year-old.
He will appear at Waltham Forest Magistrates Court on Thursday.
Four teenagers have already appeared in court charged with the teenager's murder.
On Wednesday, a 13-year-old was arrested in east London in connection with the investigation.
A 15-year-old arrested on Tuesday is still being questioned by detectives.
In addition a 19-year-old man and two youths, aged 14 and 15, have been bailed until June.