Most horror stories begin ordinarily enough - the comfortable home, the happy family, the loving couple.
And so it was with Nathan Zamprogno, who in 2008 was living with his wife, Kylie, and their five-year-old son, Liam, in Richmond, a small town at the foot of the Blue Mountains, west of Sydney.
Nathan and Kylie had met as teenagers in a local church group, and had been married almost 10 years...
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