A man will appear before court on Saturday charged with murdering 17-year-old Jodie Chesney.
Jodie died after she was stabbed in the back while she listened to music with friends at Harold Hill, east London, on Friday, March 1.
Police announced overnight they had charged 20-year-old Manuel Petrovic, from Romford, with murder and he would appear before Barkingside magistrates.
He was arrested in Leicester on Tuesday.
A second man arrested in London on suspicion of murder on Friday remains in custody, Scotland Yard said.
Jodie's father Peter Chesney had described the teenager as a "proud geek" and a "great girl", adding: "The fibre of her being was just about being good, kind... there was nothing bad in her body."
He said Jodie's death had torn the family apart and said: "We don't know how to deal with it.
"Everyone is suffering because she was so good... everyone just can't believe - why her? It is not one life deserves to be killed over another, but specifically her, she was so kind."
Her death has added to the urgency for action to be taken to tackle knife crime across the UK.
On Thursday, people wore purple ribbons and carried purple balloons in memory of the teenager as they took part in march through Romford calling for an end to knife crime.
Police said the murder investigation into Jodie's death continues as they appealed for anyone with information to call the Homicide and Major Crime Command Incident Room on 020 8345 3775, or call Crimestoppers anonymously on 0800 555111.
Additional reporting by the Press Association
