Fighting back tears, Michelle Liddle has accused two "gutless" boys of hunting and killing her 15-year-old son before taking aim at their "menacing" families.
In a heartbreaking victim impact statement, Ms Liddle told the boys she hoped they were locked away for a long time after her son Angus Beaumont was fatally stabbed in a fight north of Brisbane in March 2020.
However, she claimed her family had been serving a life sentence since Angus died after a knife was thrust 14cm into the year 10 student's chest at Redcliffe.
"My beautiful boy, rest in peace because there is none for us," Ms Liddle told the Brisbane Supreme Court.
The two boys - who can't be named - congratulated each other after Angus was stabbed.
They were both 14 at the time. One is now 16 and the other is 17.
The boys were found guilty of murder by a jury in June.
"Your actions on that night were deliberate, callous and determined. You had every intention to hunt and kill," Ms Liddle said.
"Your family and supporters have been remorseless and consistently menacing towards our family.
"It is clear by these acts of violence ... the remorselessness you have shown ... your gutless, selfish actions ... that you have no intention of changing your behaviour."
Ms Liddle broke down as she described the night her family raced to the hospital after learning that her "beautiful, intelligent, healthy kid" had been stabbed.
"I didn't even get to say goodbye or tell my son how much he was loved," she said.
"Hearing my youngest cry 'that's not my brother'... after seeing Angus ... as a consequence of your vicious attack, you even robbed our family of the right to farewell our boy with any dignity.
"You destroyed our family. Our life as we knew it ended that day."
Ms Liddle said since Angus' funeral, daily life had been a struggle.
His younger brother even told them he didn't want to go on a family holiday again because "it is too hard without Angus", she said.
CCTV footage captured the incident after the two boys pursued a group of youths that included Angus.
Wearing knuckle dusters and handed a knife by another member of his group, Angus confronted the duo and he was stabbed in the chest after being set upon in a two-on-one fight.
The two boys are seen congratulating each other by slapping hands before running away as Angus lay dying nearby.
"It shows their mindset at the time that they were happy that this boy was stabbed," crown prosecutor Chris Cook said.
Both boys had long criminal histories with one offending from the age of 11.
One boy was on parole and the other was on bail at the time of the murder.
One of the boys on Tuesday also pleaded guilty to three more offences including dangerous operation of a vehicle after stealing a car in May 2022 while on bail for murder.
Ms Liddle said their Justice for Angus Beaumont foundation would continue to fight for Queensland juvenile justice law changes and curbing youth violence.
"This has affected our whole community who no longer feel safe knowing people like you are walking amongst us," she told the two boys.
They will be sentenced at a later date by Justice David Jackson.
