A "dangerous" man is wanted by police in connection with the murder of Ahmed Jama just after Christmas.
Scotland Yard has released a picture of Arlind Hashani, 20, who they say is "dangerous and should not be approached".
Ahmed Jama was found with stab wounds near near Gaymead on the Abbey Estate, Abbey Road, at around 7.32pm on December 29.
A 21-year-old man was arrested on suspicion of murder on January 4.
A 25-year-old was arrested on suspicion of assisting an offender on January 7.
Two 25-year-old men were arrested on January 17 on suspicion of conspiracy to commit murder.
All four men have been released on bail.
Detective Chief Inspector Neil Rawlinson, lead investigator, said: "We urgently need to trace the whereabouts of Arlind Hashani.
"He is considered to be dangerous and should not be approached.
"Anyone with information on his whereabouts should call 999 or report anonymously to CrimeStoppers by calling 0800 555 111."
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