Daniela Poggiali, 42, of Lugo, Italy was arrested this past weekend after being suspected of killing 38 patients over the years who police say she found annoying. According to the Italian newspaper Corriere della Sera, Poggliali was arrested under suspicion of killing 78-year-old patient Rosa Calderoni with an injection of potassium chloride.Police confiscated Poggiali's cell phone which they say included the nurse taking a selfie and giving a cheery thumbs up with a patient who had died moments prior. It will be difficult to prove homicide for Poggiali's supposed earlier victims, as potassium chloride is hard to detect after a few days since entering the body, according to The Daily Dot. According to the Corriere della Sera, Co-workers of Poggiali have described the nurse as tireless but also cynical and vindictive. Co-workers suspected misconduct after patients would mysteriously die under Poggiali's care, and that the nurse had also gave laxatives to other unknowing hospital employees.