List of serial killers by number of victims
German convicted serial killer and former nurse Niels Högel begins his third trial (previous convictions were in 2008 and 2015), this time in Oldenburg, for additional patient murders by administering fatal doses of medication between 1999–2005 which may include his assignment as one of Germany's worst serial killers since World War II. At the beginning of the trial, Högel confesses to the murder of 100 of his patients.
Sources: BBC Deutsche Welle