A 17-year-old boy police had sought in connection to the murder of Hampton teenager Jamil Palmer handed himself into police this afternoon.
He remains in custody.
Detectives investigating the death of former Richmond College student Mr Palmer, 18, have offered a £15,000 reward for information that leads to the arrest and prosecution of whoever is responsible for the killing.
Anyone with information is asked to contact the incident room on 020 8785 8099 or call Crimestoppers anonymously on 0800 555 111.
Four males have previously been charged with the murder of Jamil Palmer.