Female serial killers, the common feature of these women is that they have killed at least 3 people, leaving some time between 30 days spread over a long period. I will tell you five serial killers who will freeze people's blood and who have made the most brutal murders of human history. Serious killers in the world are mostly unknown, but they are from the USA. The first female serial killer in the world is the American Aileen Wuornis. He killed 7 people in the relationship. This has shaken the whole world, not the people of the United States, and perhaps this number has inspired American women to increase the number of female serial killers.