A doctor responsible for a patient who died of a suspected overdose of potassium has quit working at the hospital in Rumburk in North Bohemia where the death took place, the news site Aktuálně.cz reported. On Friday police charged a former nurse at the hospital with murder in connection with the case. Petr Vondráček said he was leaving the hospital after its director, Darek Šváb, said the doctor had given liver failure as the cause of death, failed to order a post mortem and did not contact the police despite the suspicion that a crime had been committed. Dr. Vondráček denied these accusations at a hastily arranged news conference. Police suspect the nurse of euthanising a 70-year-old cancer patient out of sympathy for the woman’s critical condition.