Police have named the victim as Michael Fadeyibi (credit: Met Police)
Michael Fadeyibi died after he was stabbed in the neck in Henniker Road at around 1.40am on Friday, 6 August.
A post-mortem examination gave the preliminary cause of death as a brain haemorrhage.
Emergency services also found a second man with stab injuries at the scene.
The 19-year-old was taken to an east London hospital where his condition was assessed as non-life-threatening.
He was later arrested on suspicion of murder and bailed pending further enquiries until a date at the beginning of September.
Two others, a 22-year-old man and a 17-year-old boy were arrested on Sunday, 9 August for the same charge.
They remain in custody at an east London police station.
A 24-year-old men and a 19-year-old woman were arrested on Sunday, 9 August on suspicion of assisting an offender.
The pair also remain in custody at an east London police station.
Met Police are continuing to appeal for witnesses and further information.
Anyone with information about what happened is asked to call the incident room on 020 8345 1570.
Alternatively, call 101 quoting CAD 516/06AUG. To remain anonymous, contact Crimestoppers on 0800 555 111.
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