A man and woman have denied murdering a 36-year-old man whose body was found in a "frog-like" position in his Brisbane home.
Paul Mathew Moore, 37, and Emily Jane Tracey, 38, are standing trial in the Brisbane Supreme Court charged with murdering James Switez-Glowacz.
Tracey had been in an "on-again-off-again relationship" with Mr Switez-Glowacz after meeting him when she was 16 years old, crown prosecutor Danny Boyle told the court on Tuesday.
The Russell Island resident has a daughter with him, and also twins with her co-accused.
Mr Switez-Glowacz's body was found by his father - who hadn't heard from his son for days - next to a futon on the ground floor of the unlocked unit in the Brisbane suburb of Wynnum West on February 8, 2018.
He was in a frog-like position, on his knees with his legs out to the side, leaning forward with his head on the ground, Mr Boyle said.
Mr Switez-Glowacz's T-shirt was pulled up covering the back of his head and face, his right hand was behind his back and he was surrounded by a pool of blood.
The 36-year-old died from haemorrhaging, having being stabbed eight times in his head and body.
An autopsy found he died days before his body was found.
Mr Switez-Glowacz had mental health issues, was on medication and had an alcohol and drug problem, the court was told.
He also spent time in jail for assault.
"It's clear that James Switez-Glowacz wasn't an angel (and) it's accepted that there was some violence in his relationships which his family says was in the context of his drug abuse," Mr Boyle said.
But his family describe him in the lead-up to his death as being "the best he had ever looked" compared to what he was like when using drugs.
Mr Boyle said CCTV showed Tracey's car at points between Moore's house in Logan and Mr Switez-Glowacz's unit during the evening of February 6.
It is also the Crown's case that DNA linked Moore to the crime scene.
The court was told Moore sent messages to his sister's boyfriend about two weeks before the death in which he referred to stabbing Mr Switez-Glowacz.
He claimed Tracey had sustained a black eye and broken nose from Mr Switez-Glowacz.
Barrister John Fraser said in his opening statement Moore admits he stabbed Mr Switez-Glowacz, but the issue for the jury will be whether his actions were unlawful.
Tracey's barrister Leon Ackermann told the jury the prosecution had put up three scenarios about the killing including claiming Tracey drove with Moore to Mr Switez-Glowacz's house
"I expect an issue in this trial will be whether there was ever any common intention with Mr Moore to seriously assault the deceased," he said.
The trial continues before Justice Martin Burns.