A motorbike rider was struck and killed in a crash with a BMW at the intersection of Bell and Victoria streets at Preston in Melbourne's north early on Sunday.
The BMW and another car had been stolen from Pascoe Vale South about an hour earlier, police said.
Two occupants of the BMW fled the crash scene, with a 16-year-old boy believed to have been a passenger later arrested and taken into custody for questioning before being released pending further inquiries.
Premier Jacinta Allan said she was unable to comment on the cause of the crash but described the man's death as a tragedy and expressed sympathy for his family.
"It must be an incredibly deeply distressing time for them," she told reporters on Sunday.
Victorian Premier Jacinta Allan was coy about possible amendments to the youth justice bill. (Joel Carrett/AAP PHOTOS)
The Victorian government and courts faced fierce criticism after a teenage boy was bailed over a crash at Burwood on July 2 that killed 28-year-old trainee doctor William Taylor.
The 17-year-old, who was allegedly behind the wheel of a stolen Jeep with five other teens inside when it crashed into Mr Taylor's car, was initially granted bail but had it revoked after breaching conditions.
In response to backlash, Ms Allan confirmed the government would strengthen youth crime legislation following a series of meetings with key stakeholders.
The government's standalone youth justice bill has since passed the Labor-controlled lower house and could be debated in the upper house as early as this week when parliament returns.
The premier was tight-lipped when asked if amendments would be moved to the bill this week, declaring the government would have more to say "soon".
"There is a pattern of behaviour here that is causing harm and it's also causing me, and so many in the community, concern," she said.
The bill includes an electronic monitoring trial for up to 50 young people on bail and lifts criminal responsibility from 10 to 12 years of age, a first for any Australian state.
The state government previously vowed to raise it again to 14 by 2027, with some exceptions for serious offences such as rape and murder and subject to an "alternative service model".
Ms Allan declined repeated opportunities to reaffirm the government's commitment to the second change as outlined by her predecessor Daniel Andrews.
Opposition Leader John Pesutto called for the premier to walk away from the planned lift to 14 amid what he dubbed a "youth crime wave".
"It sends the wrong message and it will leave Victorians more exposed to violent and repeated behaviour by young offenders," he said.
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