Police were called to St. Mary’s Avenue in Southall at 6.41pm on Saturday, 24 August after a report of a man being stabbed.
Officers, London Ambulance Service and the Air Ambulance Service attended and treated a man in his 60s suffering with a stab wound.
He was pronounced dead at the scene.
His next of kin have been informed.
One man aged in his 30s has been arrested on suspicion of murder and is currently in hospital under police guard being treated for minor injuries.
A crime scene and multiple road closures are in place while enquiries continue.
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