Nurse Kills 38 Patients - Italian nurse Daniela Poggiali is one healthcare professional you should be wary of if ever you get confined in a hospital in Italy. For one thing, she is notorious for killing up to 38 patients after she got completely annoyed of them or of their families.

According to 6ABC.com, the 42-year-old nurse suspected in the killing of 38 patients, was arrested over the weekend when authorities noticed that something's quite suspicious about her following the death of a 78-year-old patient named Rosa Calderoni on April 8.

Police said the Lugo, Italian native, may have killed Calderoni by injecting a large amount of potassium chloride into her body, and this is believed to be the same mechanism she used when she got rid of a number of patients she found "annoying," reports Italian newspaper Corriere della Sera.

The medical substance can reportedly trigger cardiac arrest at certain volumes.

Upon her arrest, the cell phone of the woman in the nurse kills 38 patients story was confiscated and police where surprised when they saw some very disturbing photos in it.

Some of the pics in Poggiali's phone feature her taking a selfie and giving a pleased thumbs up in front of a patient who had died moments prior.

"In all my professional years of seeing shocking photos, there have been few like these," said Chief Prosecutor of Ravenna Alessandro Mancini.

As of late, it is still very difficult for investigators to retrieve proper evidence from the bodies of her previous victims since potassium chloride is hard to detect a couple of days after it has entered the vascular system, according to RT.com.

In an interview with the authorities working on the nurse kills 38 patients case, her co-workers admitted that Poggiali is very "cynical and vindictive."

They also said that the tireless 42-year-old was very suspicious since most of the patients left under her care would mysteriously die days after.

It was also found out that the suspect had given laxatives to other patients of the Umberto I Hospital in Lugo in the northern Italian region of Emilia-Romagna, a province of Ravenna.

She would deliberately give laxatives to the patients at the end of her shift, so that her colleagues would have to deal with the effects of the substance to the patients' bodies, noted The Independent.

Poggiali has since denied all the allegations against her.