The Leader can reveal for the first time the horrific details behind the stabbing murder of Simone Mottram in Inverell almost two years ago after Bradley Mottram admitted to the violent attack.

Mottram, now aged 21, pleaded guilty to the October 19, 2015, murder in Armidale Local Court on Wednesday.

He appeared via video link from Goulburn Correctonal Centre and remained silent as his matter was formally committed to the supreme court in Sydney where he faces a maximum of life behind bars for murder.

"Mr Mottram, your lawyer has entered a plea of guilty," Magistrate Michael Holmes said.

"You are committed for sentence to the Supreme Court of NSW."

Charges of unlicenced driving, stealing his mother's car and negligent driving were also transferred to the higher court.

"Your bail is refused," Mr Holmes told Mottram, who has been in custody since the afternoon of the murder after he crashed his mother's Hyundai Getz on Copeton Dam Rd, out of Inverell. 

Mottram's Legal Aid solicitor Wendy McAuliffe consented to draft facts being tendered to the court which show the then 19-year-old made repeated admissions at the crash scene to witnesses.

"I killed her. She's dead," he screamed at three witnesses on the road about 2.30pm.

"She's dead. I've murdered her."

He drank a can of rum and scribbled several notes as witnesses called police, repeating his admissions "continuously about 40 times" to three people at the scene.

"The ***** is dead. I've killed her. I'm a murderer. The ***** is dead," draft facts state.

In the note police seized from the scene, Mottram said "this was not planned. I was drunk, it was an accident. Holy s***, I'm sorry".

A 10-volume brief of evidence detailing the murder and relationship between Mottram and his mother was tendered to the court, detailing a history of mental health and drug and alcohol abuse.

According to court documents, Mottram was living with a family member in Woy Woy after leaving rehab in late-2015 and had been using drugs and binging on alcohol in the weeks leading up to his mother collecting him and transporting him back to Inverell the day before the murder.

On the day of the murder, several people saw Mottram and his mother at the town's library between 9.30 and 10.30am. Facts state Ms Mottram wanted him to go to the RTA to get a licence and get his life back on track but he was worried about people coming after him.

He purchased three bottles of bourbon, absinthe, chewing gum and cigarettes before returning home to the Froude St house, where the pair were alone from 11.30am to 1.30pm.

"During this time the deceased said something to the accused which made him snap," draft facts state.

"The accused punched the deceased in the face several times.

"The accused hit the deceased over the head with a bottle of Woodstock bourbon, striking her in the right temple possibly causing the deceased to lose consciousness."

Mottram then went and grabbed a kitchen carving knife from the kitchen and went to the bedroom where his mother was.

He stabbed his mother on the left side of the chest four times, then five times in the upper abdomen, penetrating her liver.

"The accused stabbed the deceased multiple times ... causing an almost complete transection of the neck," draft facts state.

"The stabbing was done with considerable force causing three deep incised wounds."

Mottram then stabbed deceased a number of times in the face.

"The accused laid the carving knife on the deceased's chest and covered the deceased with a white and brown-coloured doona," draft facts state, before walking out and leaving bloodstained footprints across the polished wood floor.

Mottram was arrested that afternoon and has been in custody since.

He will front the Supreme Court in Sydney in November.