The German nurse who had been killing his patients has been charged with 97 more conuts of murder related to the deaths at 2 hospitals in the cities of Oldenburg and Delmenhorst, dpa news agency reported.
Prosecutors said Hoegel should have been aware that the drugs given to patients in clinics in Delmenhorst and Oldenburg, in northwest Germany, could cause life-threatening cardiac problems.
He was jailed for life in 2015, but at the time it was clear he had murdered many more patients, with investigators admitting they may never know the true number as some remains had been cremated.
The third trial of Niels Hoegel, 41, accused of being the worst serial killer in German post-war history, is expected to start later this year, a court spokesman in Oldenburg said.
That admission led investigators to dig into the toxicology reports at the hospitals Hoegel worked at, leading to suspicions about other deceased patients. Additional convictions could affect Hoegel's possibility of parole, but there are no consecutive sentences in Germany. There are three further cases that are "suspicious", but the test didn't provide enough evidence for charges to be brought.
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He is accused of giving victims various non-prescribed drugs in an attempt to show off his resuscitation skills to colleagues and fight off boredom.
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.
An investigation into neglect at the hospital is ongoing.
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".
Authorities are already pursuing criminal cases against former staff at the medical facilities.