The friends of teenager Nathan Murray, who was stabbed to death in Sydenham, desperately tried to help him, a jury heard.

CCTV was shown at day three of the trial at the Old Bailey, where Marley Lucas, of Champion Road, Sydenham, denies murder.

Mr Murray, 18, from Sydenham, was caught on camera walking up and down Sydenham High Street in the morning leading up to his death on June 1 this year.

Footage was also shown of a black Fiat Punto in the area - driven by Lucas, 21.

Just outside the Co-Op, at the junction with Girton Road, the car can be seen stopping yards from Mr Murray.

Catherine Pattison, prosecuting, told the court: "Out of vision of the camera we can see the car remains stationary.

"Nathan Murray is now back in shot but his pace of travel is different, a jog as opposed to a walk.

"The left navy blue sleeve is up."

In the footage Mr Murray quickly turns a corner, followed by his three friends.

The camera captures him lifting up his top, still in front of the Co-op.

His friends can be seen gathered round him, as one phones 999.

Miss Pattison told the jury: "What we don't need to view is what happens after paramedics and police attend the scene, Nathan Murray goes to the ground."

The Punto remains for a short while, before pulling away and immediately driving down a side road.

PC Clare Dixon was one of the first on the scene, and the court heard a statement from her.

She said: "I could see a black male, who I now know to be Nathan Murray, lying on his back on the pavement.

"Nathan Murray was surrounded by three males who appeared to be applying pressure to his chest and holding him.

"I could sense panic upon the males' faces and within the crowd.

"The three males were cradling Nathan Murray."

Upon instruction they removed their jumpers to place on him to keep him warm.

She added: "They were adamant they were not taking a step back from Nathan Murray, and were keeping the pressure on his wound."

The jury heard he was stabbed on the left side of his chest, with the wound running from his armpit to his nipple, roughly four inches long.

PC Dixon said she thought the wound may have penetrated his heart.

More paramedics and the air ambulance arrived on the scene, and red blankets were held around the victim as he was treated in the street.

Paramedic Miguel Lopez treated the teenager at the scene, and a statement read on his behalf said: "The patient's mum came into the back of the ambulance but only for a few seconds, police took her out."

He was rushed on blue lights to Kings College hospital where he later died.

The court heard Lucas was arrested two days later by plain-clothed officers in a cafe in Walthamstow, where he said: "I was coming back to hand myself in at Lewisham tomorrow anyway, I heard from the street you were looking for me."

When arrested he had several wounds to his right hand, which he said was caused by a cooking incident.

The trial continues.