pregent babysitter gone missing

I read a article from the New York Times. It was about a lady that was missing for two days. A police officer saw a white truck outside the police station. He found a lady inside dead. She was diabetic. She died from a insulin overdose. She was also pregnant. She was a babysitter from Brazil. Later, they came to find out she was having a affair with her boss's husband. The wife had found out about the affair the day before the babysitter went missing. She also learned that the baby she was having was his. So, in the long run i think the wife would be a suspect in this situation. It all sounds very suspicious.