Mother-of-two Emma Lovell was fatally stabbed by a boy - who can't be named for legal reasons - in the horror 2022 attack that sparked controversial youth justice reforms in Queensland.
Her husband Lee Lovell - who was also injured in the attack - attended the High Court appeal over the teen's reduced sentence on Friday, saying he owed it to his wife to "see this through".
"I've been there from the start, and I'll continue on as long as it takes really, to get justice for her and maybe for the girls and I too," he told reporters in Canberra.
Queensland Attorney-General Deb Frecklington had successfully applied to the High Court to appeal the reduced sentence for the attack that triggered the state's "adult crime, adult time" laws.
The boy, who was 17 at the time of the murder, stabbed Ms Lovell after he broke into her family's house north of Brisbane about 11.30pm on Boxing Day in 2022.
"It is extremely rare for the High Court to give leave to an attorney-general, particularly on a criminal matter," Ms Frecklington said, standing alongside Mr Lovell in Canberra.
"This is all about restoring justice back to the Lovell family and to victims in Queensland."
The boy was sentenced just months before the new Liberal National government ushered in "adult crime, adult time" laws in late 2024, under which juveniles face life terms for serious offences such as murder.
He received 14 years in detention after pleading guilty to murder, with 70 per cent to be served behind bars.
It was reduced to 60 per cent - shaving almost 18 months off the sentence - following the successful appeal in August 2025, leaving Mr Lovell and his family "broken".
"Had this matter happened under our government, this kid would have got life, and that's the difference," Ms Frecklington said.
"We've listened to Queenslanders, learned from the tragedy of Emma's passing, and changed the laws because we believe that victims should be at the front and centre of the justice system, not criminals."
The Queensland Court of Appeal had reduced the sentence on the basis there were special circumstances, including an early guilty plea and the boy's deprived upbringing, disagreeing with the original sentencing judge.
The attorney-general's lawyers on Friday urged the High Court to set aside the Court of Appeal ruling that reduced the teen's sentence, noting the original judge had described the offence as "particularly heinous".
But barrister Andrew Hoare said the reduction to the head sentence was correct, arguing it was justified due to his client's guilty plea, genuine remorse and prospects of rehabilitation.
The High Court has reserved its decision.
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