A Canberra man who stabbed his girlfriend to death in her Macgregor home may claim he was mentally impaired during a prison yard attack on a guard a year after the killing.
Aleksander Vojneski, 31, allegedly attacked the guard in prison in August last year as he awaited trial for the 2012 murder of his girlfriend Paula Conlon, 30.
The prisoner had allegedly complained to the officer that someone had forged his identity and used his money to buy goods at the Alexander Maconochie Centre.
Vojneski is said to have become angry at the guard's response, and punched him several times in an outside prison yard.
CCTV footage captured the incident.
Vojneski was charged with common assault over the alleged attack, and is before the ACT Magistrates Court.
A hearing is scheduled for later this month, but the court heard on Thursday that Vojneski's lawyers have commissioned a report on his mental health.
That, the court heard, will help inform whether Vojneski pleads not guilty by way of mental impairment.
The alleged prison assault occurred about a year-and-a-half after Vojneski used a kitchen knife to kill Ms Conlon.
A jury found him guilty of the murder earlier this year, and he is awaiting sentencing by Justice John Burns in the ACT Supreme Court.
His sentencing hearing heard evidence about his lengthy history of mental health problems, which began when he was a young teenager.
Vojneski, also a heavy ice user, was said to have fallen through the cracks of the ACT's mental health system.
He killed Ms Conlon one night in March 2012, months after the pair had met in Ward 2n, a psychiatric unit at Calvary Hospital.
The murder took place as a teenage boy sat in a nearby room, playing video games with his headphones on.
Evidence suggested Vojneski was becoming increasingly desperate to secure drugs on the night of the killing.
But he was said to have discovered Ms Conlon, who was also trying to wean him off ice, spent the last of her money on clothes.
The murder sentencing will take place in the ACT Supreme Court on November 11.