A German former medical nurse, on Tuesday, conceded killing 100 patients, making him one
of the nation's deadliest post-war sequential executioners.
Niels Hoegel, 41, admitted to murdering his patients - between the ages of 34 and 96 - at two doctor's facilities in northern Germany somewhere in the range of 2000 and 2005.
He is accused of giving his victims various non-prescribed drugs, in an attempt to show off his resuscitation skills to colleagues and fight off boredom.
On the first day of his trial at a court in Oldenburg, Germany, Hoegel said the murder allegations against him were correct.
Hoegel is already serving a life sentence for six convictions, including homicide and attempted homicide.
Those convictions led authorities to investigate hundreds of deaths and exhume bodies of former patients in the clinics where he worked. Earlier this year, he was charged with another 97 murders.