A man found with stab wounds in an east London park on Friday has died.
Police said the 27-year-old was in a fight with another man in Plaistow Park in Newham. He died in the early hours of Monday.
A 16-year-old boy, arrested on Saturday on suspicion of attempted murder, remains in custody at an east London police station, Scotland Yard said.
A post-mortem examination is set to be held at East Ham Mortuary at 10:00 GMT.