The man was attacked in Tiverton Road, near Frogwell Close, at 4.55am today (January 13).
Officers and London Ambulance Service crews attended, however, the 36-year-old was pronounced dead shortly after.
A video has emerged showing the moment dozens of officers banged on a door near the area.
Large bangs can be heard as police break open the front door, while officers holding riot shields are heard yelling.
It is understood that there have been “two raids” related to the fatal incident.
Four men have been arrested on suspicion of murder and remain in police custody.
The road has been shut off by police early this morning, and part of the estate remains closed as investigations are ongoing.
