Bay of Plenty grandmother Donna Parangi has been found guilty of the manslaughter of her 8-month-old grandson, who died in a hot car while she smoked drugs.

A jury found the 48-year-old guilty yesterday, after a six-day trial before Justice Graham Lang in the High Court at Rotorua.

Isaiah Neil (also known as Te Whetu), died after being left in a hot car while his parents and grandmother smoked synthetic cannabis and passed out at Taneatua in 2015.

Tommy Wilson from Te Tuinga Social Services joins Mike Hosking.

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