Chilling CCTV captured the moment a teenager pleaded with her grandad not to call 999 moments after she murdered a 16-year-old love rival, saying: ‘You can’t ring the police – she’s dead.’

Kayla Smith, 18, repeatedly stabbed Chloe Watson Dransfield in the street during an arranged fight over Blake Dowling, 18, who both girls had been in on-off relationships with.

Chloe and Dowling took a taxi to Smith’s grandad’s home in Austhorpe, Leeds, in the early hours of March 28 this year.

Footage played to jurors at the city’s crown court shows Smith ‘striding quickly’ from the summer house she was living in clutching a knife, followed by pal Archie Rycroft.

Outside, Ring doorbell footage captured her shouting ‘come on, big girl’ as she approached Chloe, adding: ‘Come on then, I will stab you.’

While the murder itself was not recorded, jurors were told a male could be heard laughing.

Seconds later, Smith and Rycroft are filmed running back to the summer house.

About a minute after the attack – in which Chloe was stabbed five times to the neck and back – Smith can be heard pleading with her grandad not to call 999.

Geoff Smith is heard saying ‘I’m ringing the police’ and Smith replies: ‘You can’t ring the police – she’s dead.’

He called for an ambulance 37 minutes after the stabbing, and was seen by a neighbour performing CPR on Chloe on the footpath.

The court heard Chloe was taken by ambulance to hospital but was declared dead at 6.40am, around 90 minutes after being stabbed.

Smith had gone on trial alongside Dowling and Rycroft charged with Chloe’s murder.

But she dramatically changed her plea to guilty after Mark McKone KC began opening the prosecution case earlier this week.

The two men deny murder and manslaughter.

Dowling’s mum said Smith had become ‘jealous and obsessed’ over his relationship with Chloe, the court heard.

He said Smith made repeated threats over the phone to stab Chloe.

A friend of Chloe’s who was on Facetime with her that night said she heard Dowling answering his phone and heard Smith screaming: ‘Blake I’m gonna smash your head in… you better not be with no girls… Chloe better not be there.’

When Chloe said that she was there, the witness heard Smith say: ‘I’m gonna stab you in your throat.’

Chloe’s friend said that Smith had threatened to stab Chloe before, and that Chloe would laugh, and not take the threats seriously.

Giving evidence on Thursday, the witness said that as Chloe was on the way to Smith’s house, she told her she was ‘off to get the fight that I’ve wanted for ages’.

Asked by Gill Batts KC, defending Dowling, what she thought the fight would entail, the witness said: ‘Just themselves, nothing else,’ later clarifying she meant that there would be no weapons.

Dowling booked a taxi to take Chloe to Smith’s home in Austhorpe.

Mr McKone told jurors Dowling ‘played a part in organising the violence’ that followed.

The prosecutor said: ‘Blake Dowling assisted and encouraged Kayla Smith to be violent to (Chloe) by taking (her) to the scene for the specific purpose of a fight.’

He told jurors Rycroft ‘deliberately encouraged Kayla Smith to be violent by walking with (her) to the fight, and by trying to film (her) using violence and by providing support if needed’.

When police arrested Smith and Rycroft, they were ‘laughing and joking’ with two of their friends and using nitrous oxide in front of officers, Mr McKone said.

He told jurors Dowling denied knowing that Chloe would be caused really serious harm, while Rycroft said he followed Smith out of curiosity and did not see that she had a knife.

The judge, Mr Justice Cavanagh KC, said he would sentence Smith once the trial was over.

He warned her that the only sentence he could pass for murder was life imprisonment, but that he would need to set the minimum term she must spend in custody.

The trial continues.

Get in touch with our news team by emailing us at webnews@metro.co.uk.

For more stories like this, .

MORE: Small boat migrant raped woman after using Google Translate to threaten her

MORE: Man who beheaded three children is executed as US puts two inmates to death

MORE: Police reconstruct face of murdered woman found inside bin bag in park