Crowther's brother hurt in incident
The brother of the late game show host Leslie Crowther was fighting for his life in hospital after a knife attack in which his wife died.
Frank Crowther, 87, was found near the body of his wife, Winifred, at their home in Sutton, Surrey, on Thursday.
Police are not looking for anyone else in connection with the incident.
Officers were called at about 6.30pm to an address in Lumley Road where they discovered the body of Mrs Crowther.
She was pronounced dead at the scene.
A Met spokesman said: "A post-mortem gave cause of death as multiple stab wounds.
"She has now been formally identified as Winifred Crowther, 83, of that address.
"An 87-year-old man was found unconscious at the scene. He was taken to a south London hospital where his condition is described as critical."
Officers from the Homicide and Serious Crime Command are investigating.
Leslie Crowther, who hosted The Price is Right, died in 1996 aged 63.