Police were called at approximately 2.10pm on Saturday, 14 August to reports of a disturbance in St Luke’s Road, W11.
Officers, London Ambulance Service and London’s Air Ambulance all attended the scene.
A woman – believed aged in her 70s – was found inside an address suffering stab injuries; despite the best efforts of the emergency services she was pronounced dead at the scene at 2:56pm.
Her next of kin have been informed.
A man – aged in his 20s – was arrested at the scene on suspicion of murder. He has been taken to hospital for treatment to a minor injury.
No reports of any other injuries.
A crime scene remains in place.
Enquiries into the circumstances remain ongoing.
Anyone with information that could assist the investigation is asked to call 101 or tweet @MetCC and quote CAD3950/14Aug.
Alternatively, contact the independent charity Crimestoppers anonymously on 0800 555 111.