03:13 EDT, 27 January 2021 A mother has spoken out about her pain over the death of her son from carbon monoxide poisoning - saying the tragedy was preventable. Justine Walker said her son Jesse Samuel, 12, had decided to shower in a temporary bathroom at their holiday house near the town of Haast, on New Zealand's south island, when tragedy struck on October 10, 2018. Ms Walker, from New Zealand, found her eldest child's body on the bathroom floor half an hour later, the hot water still running. The bathroom was fitted with a gas hot water unit, which she explains had been installed incorrectly, that allowed carbon monoxide to build up to deadly levels.