A 55-year-old Italian nurse was arrested on suspicion of murdering 13 elderly patients in the intensive care ward where she had worked for decades, police said on Thursday (March 31). <br /> <br />The "hospital ward killer", as police have called her, administered lethal doses of a blood-thinning drug into her victims' intravenous drips. Twelve died of internal bleeding and one of cardiac arrest, police said.
