The sister of a Sydney woman stabbed to death by her cousin over using and damaging her car says she hopes her killer "rots in jail".
Katherine Abdallah, 36, has been sentenced to at least six years and nine months in jail for the manslaughter of 21-year-old Susie Sarkis in Brighton Le Sands in 2013.
Abdallah was Ms Sarkis' flatmate and she often referred to her as her "baby sister".
The court was told the women got into a physical fight because Ms Sarkis had taken Abdallah's Mercedes two days in a row without permission.
Ms Sarkis damaged the car's wheels by running into a gutter and had been pulled over by police for speeding.
Police came to Abdallah's house where she said words to the effect "she [Ms Sarkis] is going to be in serious trouble when I get her, you guys will probably get called back".
The next day a fight broke out on their street and inside their townhouse, with both women punching and hitting each other.
"[Abdallah] seemed to have the upper hand at some stages and Ms Sarkis seemed to have the upper hand at others," Justice Julia Lonergan said.
After tussling, Abdallah went into the kitchen and armed herself with two large knives and stabbed Ms Sarkis in the right upper chest.
She then walked away and sat on the lounge as Mr Sarkis fell to the floor.
After Abdallah stabbed Ms Sarkis she called triple-0 but misled the operator by saying she was checking the victim's heart rate, but CCTV later revealed she was in fact cleaning two knives with detergent and putting them back in a knife block.
'Would have been more tolerable if killer was stranger'
Self-defence was "run hard" at trial, Justice Lonergan said, but the jury rejected that argument.
In a letter to the court in March Abdallah said:
"I have never been able to accept that my killing Suzie was criminal because I knew I acted in self defence.
"This does not mean I am not wholeheartedly sorry every single day for taking the actions that I did … there is nothing I regret more in my life."
Justice Lonergan said the CCTV footage showed a "volatile relationship" between the pair but Abdallah escalated events by grabbing knives from the kitchen.
It was a terrible crime that has torn a family apart, she said.
Justice Lonergan told the court that in the victim statement from Mr Sarkis' mother, she said it "almost would have been more tolerable if the person who killed her child was a stranger".
Abdallah was initially charged with the murder of her cousin but acquitted by a jury in 2017 who instead found her guilty of manslaughter. She was retried last year and a jury again found her guilty of manslaughter.
Outside court, Ms Sarkis' sister Christine said she would never forgive Abdallah who had not shown remorse.
"I was very close with her [Abdallah], I just still can't believe she took my sister away," she said.
Justice Lonergan said Abdallah had "not behaved flawlessly" while in jail, with a number of offences including possessing a drug and obstructing an officer.
She said there was nothing that would justify adjusting the parole period.