Male nurse administered lethal drug to 17 patients, killed eight

Petr Zelenka, a male nurse who is charged with deliberately killing eight people with a lethal doze of the blood-thinning drug heparin has confessed that he administered the drug to 17 patients altogether, injecting the drug on twenty four different occasions. In one case a patient received three dozes before the drug killed him. The hospital in question is now reviewing its medical records to ascertain whether Zelenka did not kill even more people than previously thought. He faces life imprisonment, although his defence lawyers claim he is mentally ill.