Detectives investigating the murder of Kelly Mary Fauvrelle in Thornton Heath have released CCTV footage of a man they wish to trace.

In the CCTV a man is seen walking towards Kelly's address at around 3.13am on June 29.

Just over 10 minutes later, the same male can be seen running back along Raymead Avenue, away from Kelly’s address, toward Colliers Water Lane.

Anyone who knows the identity of the man is urged to call the dedicated incident room immediately on 020 8721 4005.

To remain anonymous, call Crimestoppers on 0800 555 111.

Detective Chief Inspector Mick Norman said: "The release of this footage is 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 enquiries. I need to hear from anyone who knows who he is. If this is you, it is imperative that you contact my team immediately.

Police were called by London Ambulance Service at 3.30am on June 29 to reports of a woman in cardiac arrest inside an address at Raymead Avenue.

Officers attended along with LAS and found 26-year-old Kelly Mary Fauvrelle suffering from stab injuries.

Despite the efforts of paramedics, she sadly died at the scene.

Kelly was eight months’ pregnant. Her baby boy, who her family has named Riley, was delivered by LAS at the scene before being taken to hospital. He remains there in a critical condition.

A 37-year-old man and a 29-year-old man who were arrested on June 29 and June 30, on suspicion of murder have been released with no further action, and bailed to a date in August respectively.

DCI Norman continues to appeal for any witnesses, CCTV or footage or anyone with any information at all that could assist, to come forward.

He said: “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.

"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.”

Anyone with any information should contact police on the dedicated incident room number of 020 8721 4005, or ring 101 quoting CAD 1358/29 Jun. Alternatively, to remain anonymous, call Crimestoppers on 0800 555 111.