Accused murderer Aleksander Vojneski promised mental health workers 'never again' after allegedly threatening to stab a former girlfriend with a knife in 2007.
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But, less than five years later, Vojneski, 31, is accused of stabbing another girlfriend, Paula Conlon, 30, to death on a bed in her Macgregor home.
The ACT Supreme Court heard further evidence about Vojneski's past as his murder trial entered its third day on Wednesday.
A former girlfriend of Vojneski spoke of an incident in September 2007, when the pair were living together in a flat in Hawker.
She said she'd come home and told him that a man was hassling her on the bus for a phone number, which she'd eventually handed over to avoid a scene.
The woman, giving evidence via video link as Vojneski watched on, said her then boyfriend had become angry.
"He said 'do you want me to stab you? I'll stab you'," she said.
"I said 'please don't, I didn't mean it'."
She gave evidence that Vojneski went to get a knife from the kitchen and she ran to her neighbour's house.
The woman, under cross-examination by barrister Jack Pappas, said she only thinks she saw the knife in his hand.
She also said their relationship was generally happy and stable, that he was a happy drunk, and became calm and relaxed when using marijuana.
Vojneski, she said, wasn't badly affected if he didn't take medication for mental health issues.
A mental health clinician who was then responsible for Vojneski said the woman had told her of the incident with the knife.
She said she had called Vojneski to ask him about it, and he said it was "no big deal", but conceded it was wrong of him.
"He said he would not do anything of the sort again."
Ms Conlon, a mother of three, was found dead with 11 stab wounds in March 2012.
A former neighbour told the court Vojneski had slashed his tyres in 2011.
The man said Vojneski thought his neighbour had called the police on him.
The neighbour said Vojneski later threatened to kill him while holding a knife and hanging over his fence.
"He just said it normally with a funny look on his face," he said.
The court heard from a mental health worker who said Vojeski told her he'd taken Xanax, a prescription drug for anxiety and panic attacks, and been drinking that night.
He said he couldn't remember what had happened.
The trial continues before Justice John Burns.