By the time Heide Victoria Bos realised she'd made a terrible mistake, it was too late.
"I changed my mind," she texted an associate.
Unknown to her, that man had already allegedly carried out Bos's orders about 90 minutes earlier — and had taken things well beyond their original plan.
The Supreme Court heard Bos had asked the man to attack her abusive boyfriend, Nicholas Cameron, in an attempt to make him "leave town".
Instead, the man is accused of staking out Mr Cameron's apartment complex in the central Melbourne suburb of Southbank, and then attacking him with a knife and hammer for 11 minutes in the car park.
Mr Cameron couldn't be saved by paramedics who rushed to the scene.
The man was arrested at the scene and allegedly told police: "I stabbed a f***ing ice dealer".
On Wednesday, Bos was sentenced to six years in prison for manslaughter for her role in the July 2021 killing.
'Slave' carried out deadly attack on victim
The court heard Bos, a dominatrix, had met the man on a fetish-themed social media site, where he agreed to be her "slave" and follow her orders.
During sentencing, Justice Michael Croucher said Bos had asked the man: "Could you make him leave town?"
"Yes, my lady, I can be very persuasive," the man replied.
The man is due to face a Supreme Court murder trial later this year.
Justice Croucher said the 39-year-old victim, Mr Cameron, was at times "nasty and controlling" towards Ms Bos, but never violent.
Justice Croucher said Bos reached "the end of her tether" when she concocted the "hare-brained" plan with her co-accused for Mr Cameron to be intimidated.
In messages obtained by police, Bos described Mr Cameron as an "f***face loser" and said: "I wish I could come give this c*** a good kick in".
Mr Cameron was attacked just after midnight on July 9, 2021, as he stepped out his apartment and headed to his car, while walking his dog on a lead.
"He had no idea that a man he did not know was lying in wait for him in the shadows, with violence on his mind," Justice Croucher said.
"Ms Bos had no idea that he had a weapon and would attack him so mercilessly."
By the time she texted her co-accused to call the plan off, it was "far too late", the judge said.
According to victim impact statements, Mr Cameron was also in a relationship with another woman and was due to be a father at the time he was killed. The court heard the mother of his child cries daily over his loss.
Mr Cameron's mother was also bereft, Justice Croucher said.
"The joy in her life has gone," he said.
Bos could be released in 18 months
After Mr Cameron's death, Bos initially denied knowing her co-accused, but later admitted her part in the incident when police linked the pair via a $2,000 bank transfer.
Prior to the incident, the court heard Bos's mental state had deteriorated after a marriage break-up and the death of her ex-husband.
Her drug habit was made worse when she started seeing Mr Cameron, a landscaper who was also a low-level methamphetamines dealer.
Justice Croucher said Bos had "excellent prospects of rehabilitation", when sentencing her to six years and three months in prison for manslaughter.
A non-parole period of three years and three months was set — meaning she could walk free from prison in 18 months due to time already spent in custody.
