A teenage boy has died months after a Barton Highway crash, which also resulted in the death of another young passenger.
The alleged driver, who is now 15 and cannot be named due to his age, is expected to face an additional charge as a result of the second death.
So far, he has been charged with culpable driving causing grievous bodily harm, culpable driving causing death, and driving a stolen motor vehicle.
On Wednesday, an ACT Policing spokesperson said a passenger, who was aged 14 at the time of the crash, "recently died as a result of his injuries".
"An additional charge of culpable driving causing death will be laid against the 15-year-old boy who was allegedly driving the Toyota at the time of the collision," they said.
The alleged driver, who was also 14 at the time, was arrested about 2am on January 18, approximately two hours after it is said he drove an allegedly stolen Toyota Avalon in Belconnen through a red light.
The ACT Children's Court previously heard he and three others, a 19-year-old and two other 14-year-olds, were on a "joyride" when the car crashed at speed into a Toyota Hilux just before midnight.
The 19-year-old front-seat passenger, who was extricated from the heavily damaged Avalon, was taken to hospital for urgent care and surgery but was soon after pronounced dead.
In March, the court heard the now deceased younger boy was "in a significantly impaired condition" after having initially been in a coma.
Police documents tendered in January state he was taken to hospital for surgery after "suffering from life-threatening head and chest injuries".
The alleged offender was not injured and the Hilux passengers received treatment but were "otherwise unscathed".
A witness who attended the late-night crash scene heard a juvenile say words to the effect of "I'm going to jail, I've just killed my mate".
It is not clear if the words were spoken by the alleged driver.
The 15-year-old alleged offender is set to face court again at a later date.
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