A maniacal German nurse already in jail for killing two patients because he was “bored” was charged this week with killing 97 others at two hospitals where he worked.

Niels Hoegel, 41, had previously admitted to injecting 90 Delmenhorst patients with a mix of drugs to cause cardiac crises, bringing them to the edge of death because he got a sick pleasure from resuscitating him.

He eventually told authorities he also murdered a number of patients in Oldenburg, it was reported.

That horrifying admission prompted a series of forensic exams on the corpses that led to the new charges.

The new cases include the deaths of 35 Oldenburg patients, where Hoegel worked from 1999 to 2002, and 62 patients who died in Delmenhorst where he worked from 2003 to 2005

Police implied the killer — who may be German’s worst modern-day serial killer — could have been apprehended sooner if local officials had alerted them more promptly, the Independent reported.

Hoegel is serving a life sentence for the 2015 conviction of murdering a pair of patients and attempting to kill two others.

With Post Wires