A man has been arrested on suspicion of murder after an expectant mother and her unborn child were killed in a stabbing in south London.

The 25-year-old suspect was arrested on Thursday on suspicion of the murder of Kelly-Mary Fauvrelle, 26, and her baby son, Riley, police said.

The Royal Mail worker was eight months pregnant when she was killed in the bedroom of her home in Raymead Avenue, Thornton Heath, in the early hours of 29 June.

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Her baby son - who was named Riley by family members after he was delivered by paramedics - died in hospital on 3 July.

A Metropolitan Police statement said: “On Thursday, 11 July detectives investigating the murder of Kelly Mary Fauvrelle and her baby son, Riley, arrested a 25-year-old male on suspicion of murder.

“The male has been taken to a central London police station where he remains at this time. Inquiries continue.”

The attack took place in Ms Fauvrelle’s bedroom while her whole family was at home and relatives heard her screams at about 3.30am.

Royal Mail worker Kelly-Mary Fauvrelle, 26, who was heavily pregnant when she was stabbed to death in her bedroom in Thornton Heath, south London, on 29 June 2019. (Metropolitan Police/PA)

Two men were previously arrested on suspicion of murder.

One, aged 37, was released with no further action, and a second, aged 29, was released on bail until early August.

Anyone with information is asked to call the police incident room on 020 8721 4005 or Crimestoppers anonymously on 0800 555111.