“It should have been the … maximum penalty that was able to be imposed,” an emotional Field told reporters.
“If this doesn’t send a message to the lawmakers of this state, nothing will.”
Redland City Council Mayor Karen Williams has started a petition asking Fentiman to lodge an appeal, as well as make changes to the Youth Justice Act.
Queensland’s LNP opposition supports the petition, with Leader David Crisafulli saying the sentence was too lenient and would not deter other youth offenders.
“Tragedies are the inevitable conclusion of a broken youth justice system,” he said.
“A sentence that is proportionate to the crime is necessary.
“A sentence that acts as a deterrent is necessary.”
Fentiman ruled out signing the petition herself on Saturday, saying it would be inappropriate to do so as the current attorney-general.
“I would also say that since this case last year, we have strengthened our Youth Justice Act to make sure that when young people commit a serious offence, there is a presumption against bail,” she said.
“Those laws are working – many young people who have committed serious offences are not getting bail.”
Leadbetter and Field died at the intersection of Finucane and Vienna roads in Alexandra Hills, east of Brisbane, about 5.30pm on Australia Day 2021.
Leadbetter was five months’ pregnant with the couple’s first child – a son to be named Miles.
The court heard the killer had been before the Children’s Court seven times on 107 charges, his first appearance in 2019 as a 15-year-old.
He was on bail for other offences when he killed the pregnant couple.
His historical offences included driving unaccompanied while holding a learner’s licence and with a blood-alcohol reading of 0.46, as well as striking a young woman with a weapon while he was trying to steal a car.
– with Toby Crockford, AAP