After a parolee's obsessive sexual jealousy led him to murder a perceived rival, he declared he was having a bad day.
Scott David Weaver had been stewing for weeks over his belief he'd almost caught his lover and his 67-year-old victim having sex in the kitchen.
After challenging Larry White with "so you want to f*** my missus do you?", Weaver stabbed him in the victim's North Gosford unit on the NSW Central Coast in December 2019.
Justice Stephen Campbell on Friday jailed him for 24 years and eight months with a non-parole period of 18 years and six months.
A Supreme Court jury had found the 40-year-old guilty of murder, rejecting his guilty plea to manslaughter.
The judge also rejected his claim that Mr White, a smaller and older man, had armed himself with a knife before the fatal wounding.
As he lay dead in his flat, Weaver arranged to buy drugs and made a "somewhat despicable" comment to the effect he was having a bad day.
Weaver had been in a sexual relationship with Yolanda Howlett, whom Mr White had allowed stay in his spare bedroom while Weaver was in jail for drug offences.
The judge said they were all heroin addicts, while the men also were drug dealers carrying knives to protect themselves.
On Weaver's release on parole, Mr White agreed he could stay in the spare room with Howlett although their time there extended his expectation.
Weaver had formed the belief that she was being unfaithful to him by having sex with Mr White.
"He was convinced that he narrowly missed catching them in flagrante delicto in the kitchen of Mr White's open plan unit on the first or second evening of his residence there," the judge said.
She vehemently denied the accusation.
His belief about the kitchen incident "became a searing conviction as a result of his dark ruminations about it".
The judge found his jealousy had been eating away at him for many weeks and had grown into an angry and jealous ill-will towards Mr White.
The day of the stabbing was Howlett's birthday, but Weaver had stayed out all night and had a prolonged argument with her on his return.
Drug-affected, he brandished his large knife at the older man while confronting him with the sex challenge and inflicting six separate wounds.
Describing the attack as "determined and desperate", the judge found he did not intend to kill but did mean to inflict grievous bodily harm.
"I have made it abundantly clear that I accept that the offender had a motive of obsessive and angry sexual jealousy for his conduct."
He didn't ring triple zero, but did apply home-fashioned tourniquets on the bleeding wounds before evading arrest for almost two weeks.
The judge referred to victim impact statements by Mr White's daughter and niece both who had suffered very significant emotional distress.
In finding Weaver was not genuinely remorseful, Justice Campbell noted his jail letters included aspects of blaming his victim and Howlett.
He had a criminal history and his prospects of rehabilitation "are no better than very guarded".
Howlett gave evidence at the trial after her murder charge was dropped and replaced with being an accessory after the fact.
