The number of actual killings is likely higher because some possible victims were cremated, making it impossible to gather evidence, Kuehme added.
In past hearings, Niels H. conceded intentionally infusing patients at two facilities in northern Germany with savage medications and after that endeavoring to restore them so as to play the legend, German telecaster NDR said.
Meanwhile, the convict himself claimed that he had killed over 80 patients in the intensive care units of hospitals in the cities of Delmenhorst and Oldenburg by giving them a lethal dose of medication.
He told the court at the time he deliberately caused patients to have cardiac arrests as he enjoyed the feeling of being able to resuscitate them.
"This number is exceptional, unique in the history of the German republic", head of the inquiry committee, Arne Schmidt said, reported 7 News, citing AFP.
Hoegel was sentenced to 7½ years in prison on attempted murder charges for trying to give a patient an overdose of the drug in 2008 and then a life sentence in 2015 after he was found guilty on six murder counts for following through on others.
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Kuehme said numerous deaths could have been prevented if the medical officials at the clinics in Oldenburg and Delmenhorst would have gotten law enforcement involved sooner.
Prosecutors have always believed he killed more people, putting the estimated figure at 43 in 2016.
The crimes came to light after Hoegel was convicted of attempted murder in another case.
Authorities have subsequently investigated hundreds of deaths, which included exhuming bodies of former patients in the clinics where Hoegel worked in Delmenhorst and Oldenburg in northwest Germany.
Heogel worked at the Oldenburg hospital from 1999 to 2002 and in Delmenhorst from 2003 to 2005.
He reportedly said he felt overjoyed when he received praise for bringing a patient back from the brink of death.