The 17-year-old boy, who cannot be named for legal reasons, was convicted of murdering GP Ash Gordon by a Victorian Supreme Court jury on Wednesday.
He had admitted two counts of aggravated burglary after breaking into the Doncaster home of Dr Gordon while he and his housemate were asleep in the early hours of January 13, 2024.
The boy showed no emotion standing in the dock as the jury foreperson delivered the verdict while his victim's family broke into tears.
The teen and another boy had attended a house party the night before the killing when they noticed Dr Gordon's Mercedes-Benz in his garage and had discussed taking the car, prosecutor Kristie Churchill said.
Just after 4am, the accused and another teen walked over to the home before breaking in through a partially opened garage door where they stole shoes, headphones, laptops, a wallet and silver necklaces belonging to the victim.
Returning to their friend's house, the boys "boasted about things they stole" and planned to return for the car.
Four teenagers donning gloves, balaclavas, face masks and hats broke in a second time, but they didn't go undetected, with the doctor catching them inside his home before chasing the teens out onto the street.
Dr Gordon got into his car and began chasing three teens until they ended up in a nearby carport.
As the 33-year-old got out and attempted to restrain the then-16-year-old, telling him the "cops were on the way", the boy revealed a knife and inflicted 11 sharp injuries, stabbing the doctor six times and left the victim dying on the ground.
The two other boys, who had earlier jumped a fence, returned after the accused yelled for help before one allegedly kicked Dr Gordon in the face so forcefully that his eyes rolled into the back of his head.
The boys fled and burned their clothing before meeting up the day after when they discussed fleeing the country and not to snitch. The accused was arrested three days after the stabbing.
Defence barrister Amelia Beech told the jury the teen admitted stabbing Dr Gordon causing his death but denied intending to kill or cause serious injury, arguing he was acting in self-defence.
The teen gave evidence during his trial, saying he thought Dr Gordon tried to kill him with his car, and continued advancing at him in the carport even when he pulled out the knife and said "I don't want to do this".
"It didn't seem to faze him at all," the boy told the jury.
The jury of 12 took two days to come to its verdict.
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