Chilling moment boyfriend, 22, cradles two-year-old girl as he's arrested for stabbing her teenage mother to death in a jealous rage because she had kissed another man

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This is the the moment a man was arrested for stabbing his 19-year-old girlfriend in the throat, abdomen and eyes after hearing she'd kissed another man. 

Dylan Harries is seen cradling his victim's two-year-old daughter after he slashed Katrina Evemy's liver open and plunged a knife into her leg - an attack she would die from days later.

Police arrive at the scene of the brutal attack in footage to be aired on a documentary tonight. 

Harries cradles the young child of his victim after he walked around to her house to stab the 19-year-old 

At first Harries seems happy to comply with the police, who frisk him after arriving at the scene of the murder 

Miss Evemy - who was also bitten during the assault - was declared brain-dead after ‘catastrophic and irreversible’ brain damage on April 19, six days after the attack.

Tonight a film shows how Dyfed-Powys Police investigated the murder of the young mother from Llanelli.

Former boyfriend Harries was convicted of murder and jailed for 27 years in October.

Then 22, Harries protested his innocence, claiming he found the 19-year-old covered in blood on the floor when he arrived at the house.

Officers wrestle with the murderer, who protests and demands to see his daughter during the mayhem 

Footage airing in a documentary tonight shows the moment Harries was arrested before he was jailed for the murder 

But he was found guilty by jury after a two-week trial. Just over a year since the attack, Dyfed-Powys Police has partnered with the broadcaster SC4 for a Welsh-language documentary on the case.

A dramatic collection of body-camera footage is shown to the public for the first time in the documentary, including the moment that officers arrested Harries at his victim's address. 

Police reveal how they proved their case against Harries, retracing his movements on CCTV and establishing a motive after digital forensic work on his phone. 

Detective Sergeant Kim Harries said that the case was 'difficult and emotional'.

'She was a normal girl, going about her normal day, a young mum with a young daughter,' she said. 'The case was difficult and emotional. The injuries were horrific, like I’ve never seen before. It was very upsetting. 

Harries (left) murdered young mother Katrina Evemy (right), stabbing her in the throat, eyes and abdomen

Harries (right) flew into a jealous rage and attacked his then girlfriend (left) who died of her injuries days later 

'[Mr Harries] was a very jealous, controlling person. And that drove him to a fit of jealous rage.

'We instructed a forensic odontologist to look at a bite mark on Katrina’s arm as well as a cast of Dylan Harries’ teeth. His opinion was that it was conclusive that the bite mark had been made by him.'

Detective Chief Inspector Ifan Charles added: 'There are no winners when it comes to a murder investigation. You have a 19-year-old woman, Katrina Evemy, who has tragically died, a daughter who won’t have a mother for the rest of her life and then Dylan Harries had his life ahead of him but made a terrible decision that day.

Police arrived at this house to find Harries cradling the baby of the woman he had just inflicted fatal injuries upon 

Harries was captured on CCTV walking to his victim's house before he murdered her, biting and stabbing the 19-year-old 

'But I think at least now Katrina’s family have some closure, knowing that Dylan Harries has received justice for what he did.

'It has been a year since Katrina Evemy sadly died, and with the support of her family we wanted to tell the story of the investigation in to her murder.

'Katrina died in the worst circumstances, and to make things worse for her family, her killer refused to accept responsibility for his crime. 

'We hope this programme shows how hard police officers work to get justice for victims and families of the most horrific crimes.'

The murderer (pictured) was caught on CCTV the moments before he stabbed his girlfriend for kissing another man 

In the footage, Harries being frisked by officers, initially appearing calm until the officers attempt to place him in handcuffs. 

At that point, Mr Harries makes demands to see 'his daughter', and is eventually subdued on the sofa.