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Niels Hoegel, Serial Killer Nurse

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A nurse who allegedly killed his victims out of boredom has been charged with 97 murders, potentially making him one of the country’s deadliest serial killers.

The nurse, Niels Hoegel, was already serving a life sentence for six convictions, including homicide and attempted homicide. He was charged with another 97 murders Monday, prosecutors said in a press release.

He is accused of giving victims various non-prescribed drugs in an attempt to show off his resuscitation skills to colleagues and fight off boredom.

Prosecutors said Hoegel should have been aware that the drugs given to patients in clinics in Delmenhorst and Oldenburg, in northwest Germany, could cause life-threatening cardiac problems.

He is accused of killing 62 patients in Delmenhorst and 35 patients in Oldenburg clinics.

Nurse killed at least 90 patients. Hoegel was previously jailed in 2015 after being convicted of two murder charges, three attempted murder charges, and one charge of dangerous bodily assault. Those convictions led authorities to investigate hundreds of deaths and exhume bodies of former patients in the clinics where he worked.

In past hearings, Hoegel said he felt euphoric when he managed to bring a patient back to life, and devastated when he failed.

Police said the final number of murders may never be known as some possible victims were already cremated.