Police believe nurse Kristen Gilbert may have committed up to 60 murders at a hospital in Massachusetts. Some say an affair drove Gilbert to murder while others think her narcissism caused the death of these innocent patients.
Nurse Charles Cullen is one of America’s most prolific serial killers. Police say he may have murdered up to 400 victims, Cullen claimed he acted mercifully. An in-depth look into the case reveals the truth behind his motives.