The poisoning at the lake: The death of 11-year-old David Davison

It took eight days for David Davison's small body to succumb. He died on April 18 and was buried at Purewa Cemetery two days later, leaving behind his distraught parents, older sister Verity and brother Paul. It was not until after David's death that the police were called in, launching what was to become one of the country's most extensive investigations. Autopsy results showed David had died of liver failure due to arsenic poisoning and traces had been found on the critically ill Marjorie But just how it was administered, and by whom, would take nearly 50 police and detectives tens of thousands of hours to establish.