Convicted child killer Kathleen Folbigg has been pardoned, and released from Grafton prison.

She has spent 20 years in jail over the deaths of her four young children.

An inquiry into the 55-year-old’s conviction found there was reasonable doubt over her guilt.

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Investigative journalist Quentin McDermott then joined 3AW Afternoons to shed light on the unfolding situation.

“It’s an enormous turnaround,” Mr McDermott said.

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Why ‘extraordinarily renowned’ scientists want a convicted child killer pardoned