The baby son of a pregnant woman who was stabbed to death in London has died.

Kelly-Mary Fauvrelle was eight months pregnant when she was killed in Croydon in the early hours of Saturday morning.

Paramedics managed to deliver the 26-year-old’s son, who her family named Riley, at the scene of the stabbin.

But he died in the early hours of Wednesday morning, Scotland Yard said.

The news came as the force released CCTV footage showing a man walking towards Ms Fauvrelle’s address at 3.11am and running away just over 10 minutes later.

The teenagers murdered in London in 2018 Show all 21 1 /21 The teenagers murdered in London in 2018 The teenagers murdered in London in 2018 Oluwadamilolda Odeyingbo Oluwadamilolda Odeyingbo, 18, was killed in a fight in Chislehurst on 10 January 2018 Metropolitan Police The teenagers murdered in London in 2018 Hasan Ozcan Hasan Ozcan, 19, was stabbed to death on the Gascoigne Estate in Barking on 3 February 2018 Metropolitan Police The teenagers murdered in London in 2018 Sabri Chibani Sabri Chibani, 19, was stabbed fatally in the chest in Streatham on 11 February 2018 Metropolitan Police The teenagers murdered in London in 2018 Promise Nkenda Lord Promise Nkenda, 17, was stabbed to death in Canning Town on 14 February 2018 Facebook The teenagers murdered in London in 2018 Lewis Blackman Lewis Blackman, a 19-year-old rapper from Kentish Town, was stabbed to death in Kensington on 18 February 2018 Metropolitan Police The teenagers murdered in London in 2018 Abdikarim Hassan Abdikarim Hassan, 17, was stabbed to death near his home in Camden's Peckwater estate on 20 March - less tahan two hours before another man was stabbed to death nearby Metropolitan Police The teenagers murdered in London in 2018 Kelvin Odunuyi Kelvin Odunuyi, a 19-year-old rapper known as DipDat and Lampz, was shot dead in Wood Green on 8 March Metropolitan Police The teenagers murdered in London in 2018 Lyndon Davis Lyndon Davis, 18, was chased down and stabbed to death in Chadwell Heath on 14 March Metropolitan Police The teenagers murdered in London in 2018 Tanesha Melbourne-Blake Tanesha Melbourne, 17, was killed in a drive-by shooting in Tottenham on 2 April PA The teenagers murdered in London in 2018 Amaan Shakoor Amaan Shakoor, 16, was shot dead in Walthamstow on 2 April Metropolitan Police The teenagers murdered in London in 2018 Israel Ogunsola Israel Ogunsola, 18, was stabbed to death in Hackney on 4 April Metropolitan Police The teenagers murdered in London in 2018 Rhyhiem Ainsworth Barton Rhyhiem Ainsworth Barton, a 17-year-old rapper and aspiring architect, was shot dead in a Kennington Street on 5 May Handout The teenagers murdered in London in 2018 Jordan Douherty Aspiring rapper Jordan Douherty died of his injuries outside a birthday party in Romford on 23 June Metropolitan Police The teenagers murdered in London in 2018 Katrina Makunova Katrina Makunova, 17, was stabbed to death in Camberwell on 12 July 2018 Metropolitan Police The teenagers murdered in London in 2018 Latwaan Griffiths 18-year-old Latwaan Griffiths was fatally stabbed on 25 July and died in hospital after being thrown off the back of a moped in Camberwell Metropolitan Police The teenagers murdered in London in 2018 Guled Farah Guled Farah, 19, was shot in Walthamstow on 22 September Metropolitan Police The teenagers murdered in London in 2018 Ethan Nedd-Bruce Ethan Nedd-Bruce, 18, died after he was shot outside a party at a flat in Greenwich, south-east London, on 22 October. He had also been stabbed, but the gunshot wound was the cause of death. Metropolitan Police The teenagers murdered in London in 2018 Jay Hughes Jay Hughes, 15, died was fatally stabbed outside a chicken shop in Bellingham, south-east London, on 1 November Metropolitan Police The teenagers murdered in London in 2018 Malcolm Mide-Madariola Malcolm Mide-Madariola, 17, was found suffering from a stab wound outside Clapham South Tube station on 2 November Metropolitan Police The teenagers murdered in London in 2018 John Ogunjobi John Ogunjobi, 16, died in front of his parents after he was stabbed in Greenleaf Close, Tulse Hill, on 5 November Metropolitan Police The teenagers murdered in London in 2018 Aron Warren Aron Warren, 18, was found stabbed in a flat block in Greenwich on 8 December and died at the scene Metropolitan Police

Detective Chief Inspector Mick Norman of 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.”

Det Ch Insp Norman said the force was unable to say whether Ms Fauvrelle’s attacker was known to her and officers are keeping an open mind.

He added: “A dedicated team of detectives are working day and night on this investigation.

“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.

An ultrasound photograph posted on Facebook by stabbing victim Kelly-Mary Fauvrelle (Facebook)

“I am aware that there is some speculation about whether Kelly’s attacker was known to her. At this stage we simply are not in a position to say and we must retain an open mind.

“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.

In one of her last posts on Facebook, the 26-year-old had shared an ultrasound photograph with the caption: “Happy Valentine’s sweet pea...we can’t wait to meet you.”

Colleagues who worked with Ms Fauvrelle at Croydon’s Royal Mail delivery office, said they were in “total shock”.

Ms Fauvrelle was a motorbike enthusiast, who had also passed a bus driving test, and recently became an aunt.

Kelly-Mary Fauvrelle, who was stabbed to death in London on 29 June (Facebook)

Sadiq Khan, the mayor of London, said: “Violence against women is endemic in society and devastating murders in the home, like this one, show the scale of the problem we face.

“My prayers are with this innocent child, and with the mother it has so tragically lost.”

Her death was one of four fatal stabbings across London over the weekend.

A man, aged 54, died after being arrested by police during a fight in Brixton on Saturday afternoon. Two men, aged 62 and 66, have been arrested on suspicion of murder.

Later on Saturday night, a man in his 20s was stabbed to death in East Ham.

Police were called to reports of a fight in Sutherland Walk, Walworth, shortly before 5am on Sunday but could not find a victim.

At around the same time, the 18-year-old arrived at a nearby hospital with a stab wound. He was treated for serious injuries but died hours later.

Three men have been arrested on suspicion of attempted murder and police are appealing for witnesses to come forward.