Charles Cullen was considered a "Good Nurse", but he ended up murdering close to 400 patients in New Jersey and Pennsylvania. He worked at 9 different hospitals over the span of 16 years. The man is also a DRAMA QUEEN! 

Sources: 

The Good Nurse by Charles Graeber

The Wikipedia Encyclopedia of Serial Killers

murderpedia.org

goodnet.org

englishclub.com

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