Part 3 of 3

Question: you've just killed someone; what's the quickest way to dispose of the body? If you live in northern Queensland, Australia, a simple answer presents itself. Dump the corpse in a crocodile-infested river. The "salties", as Australians call them, will do the rest.

That was Matthew White's plan after he murdered Donna Steele in Cooktown. But the plan backfired spectacularly thanks to advances in forensic science and a one-in-a-million DNA match.

The third and final part of our series about familial DNA looks at the 2017 murder of Donna Louise Steele and how familial DNA helped crack the case.

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