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A sociopathic or psychopathic nurse who, with no remorse, inflicts psychological and physical pain or even death on his/her patients and/or employees.
The nursiopath in the movie "The Honeymoon Killers" (1969), based on the real life nursiopath, Martha Beck

Charles Edmund Cullen, the New Jersey nursiopath who confessed to killing at least 40 patients in his 16 year career

Chelsea McClellan, the baby killing Texas nursiopath
by FECJAK October 05, 2013