Although The Good Nurse only shines a light on two patients, it appears that Cullen actually was a spree-killer with over 10 murders to his name. Per TheCinemaholic, Cullen is reportedly responsible for at least 13 murders in Somerset Medical Center, which is depicted as Parkfield Memorial Hospital in the film.
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As per Charles’s source text via TheCinemaholic, “Charlie never knew how many he did at Somerset,” however, “16 murders were ultimately confirmed from just the last six months of Cullen’s career.”
Not to mention, Charles's book also points out that five deaths occurred at Somerset before investigators were involved, as opposed to only one death in the film.
The Good Nurse is currently available to stream on Netflix.
