A 14-year-old boy has been charged with killing teenager Jeremie Malenge in Homerton High Street, Hackney.
Malenge, 17, was stabbed in the chest only an hour after being questioned by police on January 6.
Also charged over his killing is a 17-year-old boy from the borough of Redbridge. Another 17-year-old from Hackney has also been charged.
An enquiry by the Independent Police Complaints Commission is under way, regarding contact officers had with Malenge shortly before he died.