Female serial killers are incredibly rare because the women, in general, are not prone to murdering more than one person. Even if they do, they usually use poison or kill their victims in a non-violent way. Brutality is not common, and it is more prominent when the authorities are dealing with a male killer. However, Irina Viktorovna Gaidamachuk does not match the standard description of a serial murderer. She didn't kill because she thought it was fun or felt an urge to take someone's life. Instead, Irina did it because she needed money to feed her ever-growing alcohol addiction which did fit into the profile because she killed in order to gain wealth.