A teenage mum wept as she told a jury how she knelt by her dying boyfriend and begged him not to leave her after she had stabbed him to the heart.

Distraught Katie Mooney, 19, told a jury at Leeds Crown Court that Nicholas Morton stumbled and fell to the floor after she accidentally stuck an eight inch bladed kitchen knife into him.

Mooney denies murdering Mr Morton, 31, on June 7 while they were living in Rochester Street, Bradford, with baby daughter Chloe.

Mooney, who was giving evidence in her defence, said Mr Morton came aggressively towards here after a late-night row.

"I thought he was going to get me. I didn't expect the knife to go in him at all. He turned round and stumbled and fell. There was blood on the carpet," she said.

Mooney told how she went to her knees next to him and pulled at him, saying: "Don't leave me."

Mooney said she could not remember returning the knife to a drawer at the house.

She said she tried to lift Mr Morton to see his face to check if he was okay.

"I felt something warm against my leg. I looked down and there was all this blood," said a tearful Mooney.

She said she took Chloe and went to her mother's house in nearby Killinghall Road.

She said she did not summon the emergency services from her home as her mobile phone was broken and there was no land line.

Mooney told the court that she did not intend to hurt Mr Morton.

"I loved him. He was my world. Everything. He still is," she said.

Cross-examined by Simon Jackson QC, Mooney said she did not call the police that night when she feared Mr Morton would attack her because she did not want her baby daughter to see him being arrested.

She added she did not go straight to her mother's house after Mr Morton pushed her out into the back yard because her child was still in the house with him.

When she returned to the downstairs room Mr Morton came at her and she backed away.

"He was bright red and there were veins popping out of his neck. He kept moving and moving towards the back door," she told the court.

Mooney said that he was accusing her of having a "fancy man".

She denied that marks on Mr Morton's face were caused by her fingernails.

She said she picked up the knife with her left hand and passed it to her right hand when he was standing right in front of her.

"I was frightened and very, very scared," she said.

She told the jury that she did not move the knife towards him. "I can't remember sticking the knife in him. He came towards me like a rugby tackle. I remember feeling very frightened."

The trial continues.