Michael Patrick Afonso Peixoto died after being attacked and stabbed by a group of men in Mayfield Crescent at around 10.30pm on Tuesday, December 19.
After the attack, the suspects drove off in the car Michael had been travelling in, a grey Vauxhall Grand X Elite – registration DL19LVS.
The car has since been located.
A 22-year-old man was arrested on suspicion of murder on Christmas Eve.
He was taken into custody where he remains.
A warrant for further detention was granted which expires on the morning of Wednesday, December 27.
Detective Inspector Martin Thorpe from the Met’s Specialist Crime Command leads the investigation and said: “While this arrest marks a significant development in this investigation there is still a great deal of work ongoing.
“I would like to thank those people who have come forward with information that assisted us in locating the car Michael had been travelling in when he was attacked.
“However, I reiterate my appeal for anyone who was in the area and saw the events unfold, and has yet to speak to police, to come forward. Your information could prove to be vital in identifying those responsible for this brutal murder.”
Anyone with information that could assist is asked to call 101 or ‘X’ @MetCC ref CAD 7509/19 Dec.
You can also provide information anonymously to the independent charity Crimestoppers on 0800 555 111.