Four fire engines and 21 firefighters and officers were called to a fire at a block of flats in London Road, Morden last night (October 7).
Part of a flat on the ground floor of the block was damaged by fire.
A man and a woman left the property before the arrival of the Brigade and were treated at the scene by London Ambulance Service before being taken to hospital.
Sadly the woman later died in hospital.
The Brigade was called at 2012 and the fire was under control at 2120. Fire crews from Wimbledon, Mitcham, Sutton and New Malden fire stations attended the scene.
The cause of the fire is under investigation by the Brigade and the Metropolitan Police Service.