The victim went into cardiac arrest and died despite efforts from paramedics to save her. She is believed to have been around eight months pregnant, according to police.

The baby was taken to a hospital in a critical condition but died on Wednesday, police said. The baby was named Riley by the family of the victim.

On Wednesday morning, the Metropolitan police force shared CCTV footage on Twitter of a man seen walking toward Kelly’s address at around 3:15 a.m. local time on Saturday and then running away some 10 minutes later.

“This morning we heard the sad news that baby boy, Riley, the son of murdered Kelly Mary Fauvrelle has died in hospital. Our thoughts remain with his family. Detectives investigating the murder of his mother in # ThorntonHeath have released CCTV footage of a man they wish to trace,” the tweet read.

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“We need to identify the man shown in the footage urgently, even if only to eliminate him from our inquiries,” said Detective Chief Inspector Mick Norman, who is leading the investigation.

Over the weekend, authorities made arrests in what police are calling a “horrific” attack and “challenging” investigation. Both men, aged 29 and 37, who were arrested on suspicion of murder, have since been released with no further action and bailed until next month.

On Wednesday, Norman continued to appeal for information, saying that a team of detectives was working day and night on the 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,” he said, adding that establishing the facts of what happened was their main goal.

London Mayor Sadiq Khan condemned the attack on Twitter, writing: “Violence against women has no place in our city, and horrific murders in the home like this show the scale of the problem we face. My heart goes out to this innocent child, and to the mother they have so tragically lost.”