A Gold Coast man who killed his former mate and left him to die in a dog park after a fight over a pair of stolen shoes will be eligible for parole in September.
Jarvis Jai Farrier, 21, was just 18 years old when he stabbed Harrison Geppert, 17, in the back in September 2019.
The pair had been good mates until a bitter falling out in 2018.
Hostilities simmered for months before finally erupting during a chance encounter on September 4.
Farrier was with two others when he bought cannabis at Varsity Lakes that day.
As they were leaving, they spotted Mr Geppert walking with a friend heading to the same dealer for drugs.
Farrier called for reinforcements, and the two groups cornered Mr Geppert, blocking both ends of the street.
One of Farrier's friends was the first to confront Mr Geppert, accusing him of stealing a pair of shoes.
The ambush quickly escalated and Farrier ran to join in, arming himself with a military blade before stabbing his former friend once in the back.
The wound was not deep, penetrating just over 5cm, but enough to puncture Mr Geppert's left lung before the teen collapsed and died from cardiac arrest.
Farrier and his friends ran from the scene before he handed himself to the police later that night.
He told police he believed his former friend was armed with knuckle dusters but never intended to kill the teenager, the younger brother of former Hells Angel bikie Ben Geppert.
Farrier had bought the knife "in case he needed it" and told an undercover officer the knife "didn't even go in that far" and "shouldn't have killed him".
"I didn't even want to pull a knife, I just wanted to bash him," he admitted to the officer.
In a victim impact statement read to the court at a Monday hearing, Mr Geppert's mother Lisa said she could never forgive her son's killer, rejecting his letter of apology.
"Forgiveness, Jarvis, is something you will never get from me. I could never forgive someone who took the life of my child," Ms Geppert's statement read.
"I have been living a nightmare I can't wake up from.
"My 17-year-old son was left in a park alone, to die an excruciating and painful death and you ran. You were a coward."
Defence barrister David Funch said Farrier was "deeply remorseful" and surrendered to police when he realised Mr Geppert had died.
Justice Elizabeth Wilson said Farrier had made no attempt to stop the fight, but instead stabbed Mr Geppert in the back.
"You demonstrated no remorse. You left him there. Only hours later you handed yourself in to police," Justice Wilson said.
"Mr Geppert was not the protagonist in any way, shape or form. He was just peacefully going about his business."
Farrier was sentenced to nine years of prison, to be eligible for parole on September 3, 2022.
