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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.
April 13 – Tyler McDermott, 17, died after being found with a gunshot wound in Norman Road, Tottenham, north London.
May 5 – Wazabakana Elenda Jordan Kukabu, known as Jordan, 18, from Romford, Essex, was stabbed to death near Dagenham Heathway Underground Station.
May 5 – Renell Charles, 16, a pupil at Kelmscott School in Walthamstow, was ambushed and fatally stabbed in the chest near his school.
June 19 – Khaled Saleh, 17, was found with stab wounds in Paddington Green, central London.
June 26 – Victor Lee, 17, was found stabbed in a canal under Scrubs Lane, near Willesden Junction, west London.
June 29 – Leonardo Reid, 15, was killed during a music video shoot in Elthorne Road, Archway, north London.
July 3 – Andre Salmon, 18, was riding a moped when he was shot in the chest in Stamford Road, Tottenham, north London.
July 9 – Rahaan Ahmed Amin, 16, was stabbed in the heart in West Ham Park in Newham, east London.
July 14 – Claudyo Jauad Lafayette, 17, was killed in a fight in the street following a birthday party in Granville Road, Kilburn, north west London.
July 28 – Stefan Valentine Balaban, 19, was stabbed in Whitchurch Lane, Edgware, north London.
August 7 – Yusuf Mohamoud, 18, was found with fatal knife injuries near a supermarket in Regent’s Park Road, Finchley, north London.
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.
September 27 – A 15-year-old girl was stabbed on her way to school in Croydon, south London.