A baby that was delivered by paramedics after his pregnant mother was stabbed has died, police have said.
Kelly Mary Fauvrelle was stabbed at her home in Thornton Heath, south London, in the early hours of Saturday when she was eight months pregnant.
Paramedics managed to deliver her baby son, who her family named Riley, but he died in hospital in the early hours of Wednesday morning, police said.
The news came as Scotland Yard as the force released CCTV footage of a man seen walking towards the address before running away from the scene minutes later.
Detective Chief Inspector Mick Norman, from the Met's Homicide and Major Crime Command said: "This morning, we heard the sad news that Kelly's baby son, Riley, has died in hospital. Our thoughts remain with their family.
"This tragic development makes it even more important that anyone with information comes forward as a matter of urgency.
"We have released footage as the next step in what has been a fast-paced, and extremely challenging investigation.
"We need to identify the man shown in the footage urgently, even if only to eliminate him from our inquiries. I need to hear from anyone who knows who he is.
"If this is you, it is imperative that you contact my team immediately."
In the footage, a man is seen walking towards Ms Fauvrelle's address at 3.11am and running back just over 10 minutes later.
Det Ch Insp Norman said a dedicated team of detectives are working day and night on the investigation but the force is unable to say whether Ms Fauvrelle's attacker was known to her and officers are keeping an open mind.
"We have assured Kelly's family - and I want to assure local residents and the wider public too - that we are doing absolutely everything in our power to find the person responsible,” he said,
"One of the key aims of my investigation is to build a complete picture of Kelly's life and the people with whom she was in contact, but I also need to consider other possible scenarios.
"Members of the public may have useful information, and I am today reiterating my appeal for anyone who may know anything that will assist the investigation to make contact as soon as possible."
Two men have been arrested on suspicion of murder. One, aged 37, was released under investigation on Sunday, and a second, aged 29, has been released on bail until early August.