A confessed killer is expected to take the stand next month to explain how he accidentally gunned down a man at close range with a shotgun.
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It can also be revealed Kai Yuen, 28, has pleaded guilty to bashing a fellow inmate unconscious with part of a vacuum cleaner at the territory's jail in June last year.
His role in the incident had been suppressed by court order until it was lifted by Justice Hilary Penfold on Friday.
In February, Yuen admitted in the ACT Supreme Court to the shotgun slaying of Brendan Scott Welsh behind the Hughes shops in 2010.
But lawyers cannot agree on how the murder played out, with the defence arguing the accused did not intend to kill Mr Welsh.
The 28-year-old victim was shot dead while sitting in the driver's seat of a car in Whittle Street, Hughes about 12.30am on May 10, 2010.
One blast smashed the windshield and struck the father-of-four in the chest, while a second shot hit the frame of the driver's door.
Mr Welsh died from his wounds soon after his admission to The Canberra Hospital, despite his two passengers and paramedics attempting to save his life by performing CPR.
At a hearing on Thursday, defence barrister Richard Thomas told Justice Hilary Penfold that Yuen had been pointing the loaded shotgun at the victim when he took his left hand off the barrel to open the car door.
The weight of the barrel and a stumble on the gutter caused the gun to accidentally discharge, fatally wounding Mr Welsh.
But Mr Thomas said his client was still guilty of murder.
"It was the conduct of the accused, which was voluntary … which caused the death," he said.
But prosecutor Shane Drumgold told the court the Crown did not accept that account of the murder.
Justice Penfold on Friday scheduled a three-day disputed facts hearing for April to break the deadlock and determine what happened that night.
Mr Drumgold told the court the he would call nine witnesses for the hearing, including ballistic experts, eyewitnesses and police investigators.
He said he expected the defence to call Yuen as a witness to provide his version of events.
The Crown said the three day case would also act as a sentencing hearing.
Yuen is also expected to be sentenced over the prison bashing at April's hearing.
