A 15-year-old boy accused of crashing a stolen car and killing another teenager went on a "volatile" crime spree in the months after the alleged manslaughter, a court has heard.
The boy's subsequent alleged theft of thousands of dollars worth of alcohol and assault of a police officer "show a lack of care for all others except [his] desire to behave criminally," magistrate James Stewart said.
The teenager, who cannot be named due to his age, was arrested on Tuesday in relation to the Adelaide Avenue crash in April which resulted in the death of another teenage boy.
The alleged driver faced the ACT Children's Court late Tuesday afternoon, when he cried and dabbed his eyes with a tissue upon hearing he would not be granted bail.
The magistrate found there was "an extreme risk" of the boy re-offending and carrying out a reprisal attack if released from custody.
The 15-year-old is yet to enter pleas to manslaughter, not giving assistance after a crash causing death, dangerous driving, unlicensed driving, taking a motor vehicle without consent, driving a stolen motor vehicle, and exceeding the speed limit.
The court heard he was allegedly driving a stolen Toyota Camry at 125kmh in an 80kmh zone, before the vehicle hit a concrete barrier and flipped on its roof.
A 15-year-old passenger is said to have been ejected from the car and later died from his injuries in hospital.
The alleged teenage driver and another person are said to have fled the scene after being picked up in a stolen black Genesis GV80 SUV.
The boy's co-accused, a 20-year-old Chisholm man, is alleged to have been a passenger in the Camry.
The 20-year-old faced the ACT Magistrates Court on Tuesday, when he did not apply for bail. He is yet to enter pleas to numerous charges including being an accessory to manslaughter after the fact.
In the Children's Court, prosecutor Soraya Saikal-Skea argued that despite being the alleged driver in the fatal crash, the accused boy "committed a string of offences in the months that followed".
She described the death as an "emotional and devastating matter" and said the child was now facing "an incredibly serious charge".
Ms Saikal-Skea stated the accused child's "decision making appears to be very poor, the behaviour appears to be very volatile".
"There are genuine concerns, it seems to me, in respect to retaliation," she said.
"He has been given the benefit of bail over and over again ... that decision is no longer appropriate."
Defence lawyer Natasha Goode argued there was "no detail" in police documents about why it took police "so long to follow up" with the boy.
"[It is] certainly unclear as to how the young person is identified as the driver with any solidity," she said.
Ms Goode said the boy's father, who was present in court, "feels far safer" when his son was at home rather than in custody.
Police allege the stolen Genesis was found partially burnt out in Theodore on the same day as the crash.
A 20-year-old Hume man, who is alleged to be the driver of the Genesis, has been issued a notice and is set to face court at a later date.
In a statement on Tuesday, superintendent of road and proactive policing, Brian Diplock, said the charges were the result of a significant investigation by the major collision team.
"First and foremost, I would like to acknowledge the tragic circumstances surrounding this incident, where a 15-year-old boy sadly lost his life," Superintendent Diplock said.
"Following a thorough investigation and numerous enquiries, we have been able to bring those involved in this incident before the courts.
"I would like to thank the investigators that worked meticulously throughout the last four months to determine the events that occurred that morning, and who was involved. This outcome is a testament to their efforts."
The accused driver is set to face court again in late September.
