A teenager who didn't hesitate before fatally stabbing a grandmother in front of a young girl has been jailed for 16 years over the horrendous murder that sparked landmark law reforms .

Vyleen White was murdered by the boy, then aged 16, in a car park at Redbank Plains shopping centre, west of Brisbane in February 2024.

The 70-year-old's death was a catalyst for the Queensland LNP government's controversial "adult crime, adult time" laws, ensuring juveniles face at least 20 years in custody for murder.

However, they are not retroactive, meaning the teen was today sentenced under Queensland's previous laws after earlier pleading guilty to murder.

Chief Justice Helen Bowskill described the boy's actions as "cowardly and callous" when she handed down her sentence.

The teen - now 17

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