The girl who died in Croydon on Wednesday is the 15th teenage victim of homicide in London so far this year.
Of the young people killed, the vast majority, 13, were stabbed, while two were shot.
Here are details of those who died.
April 10 – Chima Osuji, 17, was fatally stabbed after being chased by an attacker in Chingford, east London.
Chima Osuji who was killed in Chingford on Easter Monday (Metropolitan Police/PA)
Tyler McDermott, who was shot in Tottenham (Metropolitan Police/PA)
Jordan Kukabu, 18, who died after being stabbed in May (Metropolitan Police/PA)
Renell Charles, 16, who was fatally stabbed (Metropolitan Police/PA)
June 26 – Victor Lee, 17, was found stabbed in a canal under Scrubs Lane, near Willesden Junction, west London.
Victor Lee, 17, from Ealing, who was found with stab wounds in a canal by Ladbroke Grove, in West London (Metropolitan Police/PA)
Leonardo Reid, 15, who along with a 23-year-old man was stabbed to death in Elthorne Road, Islington, London (Metropolitan Police/PA)
Andre Salmon, 18, who was shot in north London (Metropolitan Police/PA)
Rahaan Ahmed Amin, who died at the age of 17 (Metropolitan Police/PA)
Claudyo Jauad Lafayette, 17, died following a birthday party (Metropolitan Police/PA)
Stefan Valentine Balaban, 19, died in Edgware, north London (Metropolitan Police/PA)
September 4 – Anis Omar Zen, 19, was fatally stabbed in Masefield Avenue in Stanmore, north London.
September 20 – Max Moy Wheatley, 19, was stabbed in Jubilee Country Park close to Tent Peg Lane in Petts Wood, south east London.
Max Moy Wheatley died in a park in Petts Wood, south east London (Metropolitan Police/PA)
Elianne Andam, 15, who was stabbed to death in Croydon, south London (Metropolitan Police/PA)
