Minutes after the attack Mr Wright washed blood off his hands under a garden tap and demonstrated to friends how he stabbed Lisa Grace Jackson to death with a kitchen knife.

He also rang his mum and told her of the killing.

The 34-year-old showed no visible sign of emotion yesterday when he pleaded guilty to murdering his de facto wife in the West Dubbo home on December 3 2000.

Later he sat passively in the dock staring towards the floor as Crown prosecutor Peter Barnett described Ms Jackon's demise to the NSW Supreme Court at Dubbo.

Mr Wright and his victim shared a two-year relationship which was "accompanied by an overindulgence in alcohol and violence ... when they were inebriated", the court heard.

The killing occurred at the end of a three-day drinking binge, and after a group of revellers arrived at the house "for the purpose of a party", the prosecutor said.

The group was drinking the last of four moselle casks bought earlier in the day when the trouble began.

The couple began arguing and Mr Wright struck Ms Jackson to the back of her head.

He then produced a knife and sliced his partner's right hand "apparently while he was poking, not her, but the wine cask", Mr Barnett said.

Shortly afterwards "he walked towards where Ms Jackson was seated and stabbed her twice in the chest", Mr Barnett stated.

The first wound penetrated above her left breast and pierced her heart, while the second was to the base of the throat and punctured a lung, Justice Anthony Whealy was told.

Mr Wright, who cut his own hand in the attack, left a blood trail as he walked to a Thompson Street home, where he washed away the blood under a tap.

He told the house's occupants about the stabbing and demonstrated how it occurred, the court heard.

Later he walked to the Hunter Street premises where he and Ms Jackson had been staying after they arrived in Dubbo from Brewarrina about three weeks before the murder, Mr Barnett said.

He again confessed the crime to the occupant, before getting the man to dial his mother's telephone number.

Mr Wright took the phone and was heard to say he had just killed Lisa, according to the prosecutor.

After the phone call the murderer said he wanted to kill himself, however was thwarted in his attempts to get a knife from the kitchen draw.

Police arrested him at the Hunter Street address that night.

Mr Wright, who has been in custody since his arrest, entered the guilty plea shortly after he was led into the courtroom dressed in a suit, shirt and tie.

After the plea Mr Barnett tendered the prosecution's evidence against Mr Wright, which included a statement of facts, the offender's criminal history and the knife he used to kill his lover.

The sentencing hearing was adjourned until this morning when defence counsel Carolyn Davenport will present material on behalf of Mr Wright.

She told Justice Whealy yesterday it would include psychological and nureau-psycholgical reports.