Police were called to the High Street on the evening of the 5th of December where they found Ilyas suffering from knife injuries.
A post-mortem examination gave the cause of death as a stab wound to the neck.
Police know that Ilyas arrived at Sutton High Street by train.
Minutes after he came out of the station, he was involved in an altercation with a single suspect who then fled the scene.
Following extensive enquiries, the suspect was identified but officers found he had left the country from Gatwick Airport.
A 19-year-old man who was arrested on suspicion of assisting an offender was later released on bail.
Anyone with information concerning this incident should call the incident room direct on 0208 721 4622; call police on 101 or Tweet on ‘X’ @MetCC quoting 6107/5DEC. Information can be given directly to police here – https://mipp.police.uk/operation/01MPS23V93-PO1
To remain 100% anonymous call the independent charity Crimestoppers on 0800 555 111 or visit crimestoppers-uk.org.