A German nurse now serving a life sentence in prison for murdering six patients may have killed 84 more, making him one of the country's worst ever serial killers, police and prosecutors said Monday.
Niels H was charged in 2015 for the murders of two people along with two attempted murders at a clinic in the north-western town of Delmenhorst - though prosecutors have long presumed he killed more people and put the figure to 43 at least previous year.
Police said Monday that investigators exhuming and analyzing more bodies had since found evidence of scores of additional murders.
"The horrific deeds of Niels H. go beyond any imagination", Johann Kuehme, the head of Oldenburg police told the Sueddeutsche Zeitung newspaper after presenting the results of the investigation.
It found that Hoegel had administered lethal injections to patients at a hospital in Oldenburg, where he worked from 1999 to 2001.
Besides the experts, the new information about Hoegel has also shocked the German police.
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"The death toll is unique in the history of the German republic", said Arne Schmidt, the chief police investigator.
Niels Hoegel has admitted to causing heart failure in his patients by injecting them.
He was sentenced two charges of endeavored murder and two checks of murder by an Oldenburg court in 2015.
He said he felt euphoric when he managed to bring a patient back to life، and devastated when he failed.
It was only when a female nurse caught Hoegol red handed the murders came to light. "The murder cases could have been prevented", said Kuehme, Police Chief. Officials have stated that many deaths could have been avoided if authorities had been alerted earlier by staff at the Clinic.