New Zealander Patricia Davison's children refused to help her die. But after her youngest son witnessed her agony, he felt compelled to carry out her wish. Did his Melbourne-based sister tell the police? Peter Munro reports.

The blue mortar and pestle had gathered dust on his mum's Welsh dresser, before he used it to crush a dozen morphine pills in her kitchen. The powdered drugs dyed the water murky brown in the glass he held to her lips. She smiled gently after drinking, holding his hand.

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