A Supreme Court judge believes two shotgun rounds Kai Yuen fired during a fatal ambush on his oldest friend outside the Hughes shops were deliberate.
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And the court has been shown chilling CCTV vision of Yuen bashing a fellow inmate with a metal vacuum cleaner pipe, leaving him slumped in a pool of blood, and requiring five plates in his face.
Yuen, 28, is facing sentencing for the June 2012 jail bashing, and for the murder of Brendan Scott Welsh, 28, outside the Hughes shops in May 2010.
Yuen had disputed the facts involved in the shooting, claiming the shotgun discharged twice accidentally, and saying he never intended to kill his friend.
The Crown - represented by prosecutor Shane Drumgold - described Yuen's version of events as a lie, made up to try and avoid a life sentence for the killing.
They pointed to his actions and state of mind in the lead-up to the shooting, and the amount of pressure needed to pull each of the shotgun's two triggers, as evidence of the deliberate nature of the shooting.
The ACT Supreme Court has sat for weeks as both sides argued the facts surrounding the murder.
Justice Hilary Penfold gave indications of her findings, including whether or not the shotgun was fired accidentally, on Monday.
Justice Penfold said both shots were fired deliberately, and said Yuen's intention immediately before the ambush was to shoot at, but not necessarily kill, Mr Welsh.
The detailed reasons behind Justice Penfold's findings have not yet been revealed.
Also on Monday, CCTV vision from the Alexander Maconochie Centre was played to the courtroom, showing the jail bashing that left a 28-year-old inmate in an induced coma and with multiple facial fractures.
It showed Yuen talk with a larger prisoner in a common room at the jail, as the victim sat playing cards with other inmates.
Yuen then took his jumper and beanie off, leaving him wearing just a white singlet, and started "limbering up", the court heard.
He then picked up a vacuum cleaner pole from behind a bain-marie, and repeatedly hit the other inmate in the face.
The inmate was left slumped in a pool of blood, and the CCTV camera zoomed in to show him bleeding heavily and being aided by prison guards.
He was rushed to hospital, put in an induced coma, and underwent facial surgery a week later to insert five plates into his face.
The vacuum cleaner pole was also tendered as evidence.
The sentencing hearing continues on Tuesday.
