A 31-year-old former nurse was turned over to prosecutors Monday after being 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 Sept. 18, 2016, at what was then named Oguchi Hospital, 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 being administered to about 20 patients, according to investigative sources.