A fifth teenager has been charged with the killing of Jamil Palmer in Crane Park, Hanworth.
The 17-year-old boy has been remanded in custody and was due to appear at Uxbridge Magistrates' Court today (23).
Police continue to offer a £15,000 reward for information leading to the arrest and prosecution of the person or people responsible for the death.
Anyone with information is asked to contact the incident room on 020 8785 8099 or call Crimestoppers anonymously on 0800 555 111.