German public prosecutors on Monday said they had brought new charges against a killer nurse already serving a life sentence for murdering two patients, accusing him of killing another 97 people with lethal injections.
In November, officials said that nurse Niels Hoegel may have killed more than 100 patients while working at a clinic in Oldenburg between 1999 to 2002 and in nearby Delmenhorst from 2003 to 2005.
Hoegel was convicted in 2015 of two murders and two attempted murders in Delmenhorst and was given a life sentence.
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He later told investigators that he also killed patients in Oldenburg.
That announcement came after investigators completed examinations on patients who died when he was a nurse.
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Hoegel has admitted to injecting patients with drugs that cause heart failure or circulatory collapse so he could then try to revive them and, when successful, shine as a saviour in front of his colleagues. Additional convictions could affect Hoegel's possibility of parole, but there are no consecutive sentences in Germany.
The new charges he faces include the deaths of 62 patients at the same hospital.
Prosecutors said in a statement: "From the prosecutorial point of view, the accused Niels H. accepted, at least tacitly, in all cases the death of the patients due to the effects of the drugs".
There are now separate investigations to determine whether other staff and employees of the hospitals Hoegel worked out should be considered culpable for at least some of the murders.
As part of initial investigations, over 130 bodies were exhumed from 67 cemeteries while detectives reviewed more than 500 patient files and hundreds of hospital records.
He said: "If the people responsible at the time, particularly at the Oldenburg clinic but also later in Delmenhorst, hadn't hesitated to alert authorities - for example police, prosecutors".