The family of a murdered grandmother has slammed her teenage killer's sentence, reeling from new details of the vicious attack that triggered landmark law reforms.

The Queensland government has already indicated it will consider appealing after a teenage boy on Thursday received a 16-year maximum sentence for the attack on Vyleen White.

The 70-year-old was fatally stabbed by the boy - then aged 16 - in front of her young granddaughter outside Redbank Plains shopping centre, west of Brisbane, in February 2024.

The teen, who cannot be named for legal reasons, is likely to be released from custody in late 2033, about the time of his 26th birthday.

Ms White's devastated family broke down outside court when asked about the sentence handed down by Chief Justice Helen Bowskill for the "coward

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