Mehmood Shamshi was taken to hospital after being found seriously injured on Staines Road, Hounslow, west London, in the early hours of Wednesday August 18, the Metropolitan Police said.
Officers believe he was assaulted in Staines Road, near the junction of Cromwell Road, at around 10.30pm the previous day.
He died in hospital on August 21 and a post-mortem examination gave the cause of death as a head injury.
A 16-year-old boy has been arrested on suspicion of murder. He was arrested on Saturday August 28 on suspicion of murder and was taken into custody before being released on bail to a date in September.
Detective Chief Inspector Katherine Goodwin, who is leading the investigation, said: "Mehmood’s family and friends have been left devastated by his death and we are working hard to work out the sequence of events that led to him sustaining injuries, which we believe ultimately led to his death."
He added: "I would like to speak to anyone who was in the area, including drivers who may have any dashcam footage, of Staines Road, near to the junction of Cromwell Road, on 17 August between 10.30pm and 11.30pm, who may have seen anything suspicious."
Anyone who was in the area and witnessed anything is asked to call 020 8785 8244, quoting Op Tinos, or 101 and quote CAD 212/18Aug.