Source: BBC News
A nurse serving a life sentence for murdering two patients in northern Germany is now a suspect in at least 84 other murder cases, police say.
The 40-year-old, named only as Niels H under German reporting rules, was convicted of attempted murder in 2006 and murder in 2015.
His victims received lethal drug doses at units where he worked.
Relatives of patients who died in clinics where he worked had urged police to investigate further.