A 16-year-old boy has been arrested after a man was stabbed in a Newham park.
A 27-year-old man was found injured in Plaistow Park after the two were reportedly fighting.
He was found close to Greengate Street at about 1pm on Friday, January 29.
Police have now launched a murder investigation after the man died in the early hours of Monday, February 1.
Detective chief inspector Dave Whellams, of the Homicide and Major Crime Command, said: “I am appealing for anyone who was in the vicinity of Plaistow Park on the afternoon of January 29 and saw a fight involving two black males.
“During this fight the victim received injuries which have since proven to be fatal. The suspect then ran from the park into Hollybush Street. If you saw anything, please contact police.”
Next of kin have been informed, but formal identification is yet to take place.
A post-mortem examination took place at East Ham Mortuary on Tuesday, February 2.
The 16-year-old was arrested on Saturday, January 30 and remains in custody at an east London police station.
Anyone with information is asked to call the incident room on 020 8345 3775 or contact Crimestoppers anonymously on 0800 555 111.