"A nurse working in a northeastern Italian hospital has been arrested as part of an investigation into the deaths of 38 patients who, cops said, she may have injected with potassium because they or their family members were "annoying,"

Coworkers suspected Daniela Poggiali, 42, because patients would suddenly worsen and die during her shift. They described her as a "cold, polished" person who sometimes sedated patients who bothered her during her shift. They also suspected she gave patients laxatives to embarrass the colleagues who worked after her."