Former nurse Niels Hoegel, accused of killing more than 100 patients in his care, arrives with his lawyer Ulrike Baumann, in the courtroom, on October 2018 in Oldenburg, northern Germany, for the start of his trial. - Hoegel, 41, has already spent nearly a decade in prison for other patient deaths, and is accused of intentionally administering medical overdoses to victims so he could bring them back to life at the last moment. (Photo by Julian Stratenschulte / POOL / AFP)        (Photo credit should read JULIAN STRATENSCHULTE/AFP/Getty Images)
German nurse describes patient murders as game
01:40 - Source: CNN
Berlin CNN  — 

A German former nurse on Tuesday admitted murdering 100 patients, making him one of the country’s deadliest post-war serial killers.

Niels Hoegel, 41, confessed to killing his patients – between the ages of 34 and 96 – at two hospitals in northern Germany between 2000 and 2005.

Hoegel 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, northwest Germany, Hoegel said the murder allegations against him were correct.

Around 126 relatives of the victims are co-plaintiffs in the trial, which is expected to run until May next year, a court spokeswoman told CNN.

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.

Prosecutors said Hoegel should have been aware that the drugs he gave to patients at hospitals in Delmenhorst and Oldenburg could cause life-threatening cardiac problems.

In past hearings, Hoegel said he felt euphoric when he managed to bring a patient back to life, and devastated when he failed.

Police said the final number of murders may never be known because some possible victims were cremated.

Nadine Schmidt reported from Berlin, Sheena McKenzie wrote in London. Lindsay Isaac contributed to this report.