You could start by searching local news archives in the area where the case might have occurred. Sometimes, small - town newspapers or regional news websites might have covered the story in detail.
I'm not specifically familiar with a 'nurse Rita killer' case. It could be a relatively unknown or local true - crime story. There are many such cases around the world, but without more information, it's hard to say for sure.
It's not based on real events. 'Capturing the Killer Nurse' is probably a work of fiction that combines elements of mystery and drama to create an engaging story. Such stories are designed to captivate readers/viewers rather than report actual happenings.
In most cases, the 'killer nurse' story is fictional. Usually, such tales are made up to add drama and suspense, rather than being based on actual events. Writers might draw inspiration from various sources but not from real-life incidents of this nature.
Another important aspect is the investigation process. Detectives likely had to gather evidence, interview witnesses, and piece together the nurse's actions over time. They may have faced challenges like lack of initial evidence or the nurse's attempts to cover up. For example, if the nurse was subtly administering harmful substances, it would be difficult to detect immediately. They had to look at medical records carefully, and perhaps collaborate with other medical staff who might have noticed something off.