A 31-year-old former nurse was arrested Saturday for allegedly murdering an elderly patient in 2016 at a Yokohama hospital where three other patients also died under suspicious circumstances, police said.
Ayumi Kuboki has admitted to killing Sozo Nishikawa, 88, who died on Sept. 18, 2016, at what was then Oguchi Hospital in Kanagawa Ward, according to the police. He was found to have been poisoned with a surfactant compound.
Kuboki told them she injected disinfectant into intravenous drip bags used to treat about 20 patients, according to investigative sources.