A jealous boyfriend brutally murdered his partner who he thought was cheating on him moments after they had sex, a court has heard.

Drink and drug-fuelled Carl Chadwick, 35, strangled Sarah Keith, 26, with a dressing gown cord and stabbed her in the heart.

Leeds Crown Court today heard he launched the savage assault as he thought Ms Keith had cheated on him while he was in prison.

Chadwick armed himself with the dressing gown cord before having sex with his partner, it was heard.

Afterwards he positioned himself behind Ms Keith and, as she got to her feet, he "quickly" put the cord around her neck and strangled her.

To ensure the woman was dead, he then got a knife from the kitchen and stabbed her five times in the heart.

After concluding the heinous attack, it was heard Chadwick covered her body with a curtain, watched pornography and took cocaine.

The killer intended to flee but ended up wandering Leeds for a number of hours the next day before handing himself into West Yorkshire Police.

Chadwick, who admits murder, appeared in the dock this morning, ahead of his sentencing later in the day.

Jonathan Sharp, prosecuting, said Chadwick has a long-standing history of drug and alcohol misuse and became convinced that Ms Keith had been unfaithful to him.

Chadwick appeared at Leeds Crown Court on Wednesday (

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Huddersfield Daily Examiner)

The prosecutor said: "On this basis, he developed a settled intention to kill her, thinking about it, on his own account, 'several times a week.'

"Sarah was, of course, oblivious to this and their relationship continued."

The court heard how the murder took place after the couple had been out drinking at a pub in Leeds on April 12 this year.

They remained there all afternoon and evening, and continued drinking at a friend’s house after closing time before going to Ms Keith's flat at around 1am.

The defendant said he had six or seven pints and also bought a double whisky every time he went to the bar at the pub.

Mr Sharp said the couple were both "well in drink" by that time and Chadwick had taken cocaine.

He said: "Once home, and after the defendant had viewed some pornographic material on his phone, the defendant instigated sexual intercourse with Sarah."

The court heard they moved from the bedroom to the living room where Chadwick put a duvet down on the floor.

Mr Sharp continued: "As they made this move the defendant took her dressing gown cord and hid it behind his back, saying to himself 'I’m going to do this', i.e. kill her.

"He positioned himself so he was behind Sarah, in a position where she could not see what he was about to do."

The fatal attack took place after they had sex.

Mr Sharp said: "As Sarah got up – she did not have good balance and the defendant was aware of this – he quickly put the cord around her neck and began strangling her.

"The absence of defensive injuries on her shows that she was taken completely off her guard and was unable to put up any resistance.

"He decided to ensure her death by getting a knife from the kitchen and stabbing her to the heart five times.

"The condition of the body post mortem indicated that she was still alive when he did this."

Mr Sharp said Chadwick formed the intention of running away to Blackpool.

He added: "However, after some aimless wandering around the centre of Leeds, he then handed himself in at Elland Road shortly after 3pm.

"He made comprehensive admissions to desk staff and later in formal interview.

"The police went to the flat and their observations confirmed the accuracy of his admissions."

Following his arrest, Chadwick pleaded guilty to murder but he denies there is a sexual motive to the killing.

Chadwick gave evidence before the court this morning.

He said: "I am really sorry for what happened.

"I did love Sarah no matter what people heard or see in this court. She did a lot for me and so did her family.

"I just want to express that I am deeply sorry for what I have done."