Updated: May 16, 2019, 1:16 p.m.

In October of last year, Niels Hoegel was charged for the deaths of 97 people. During his first day of trial, Hoegel confessed that he killed his patients that ranged between the ages of 34 and 96 at two different hospitals in northern Germany between the years of 2000 and 2005.

Currently, the former nurse is serving a life sentence for six convictions against him, including homicide and attempted homicide in 2008 and 2015. Those convictions have led authorities to investigate hundreds of deaths and uncover the bodies of his former patients in the clinics where he worked.

Hoegel was accused of giving each of his victim’s various non-prescribed drugs, in an attempt to show off his resuscitation skills to colleagues and fight off boredom.

Prosecutors mentioned that Hoegel should have been aware of the drugs he administered to his patients at hospitals in both Delmenhorst and Oldenburg, located northwest Germany, that could cause life-threatening cardiac problems.

In previous hearings, Hoegel claimed he felt “euphoric” when he managed to bring a patient back to life and devastated when he failed.

As of now, German prosecutors in the northwest city of Oldenburg are seeking a life sentence for Niels Hoegel