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Similarly to general serial killers, female killers are categorized as serial murderers after three or more killings within the span of thirty days, but must have a down period (elapsed time) that occurs between kills. Lethal Ladies' authors, Amanda L. Farrell, Robert D. Keppel, and Victoria B. Titterington state that "women represented approximately 15% of American serial killers and that even the Justice Department indicated 36 female serial killers have been active over the course of the last century."

Type
Just like male serial killers, female murderers can be categorized into types of killers:
 * Black Widows
 * They get their famous name from the Black Widow spider who "who destroy their mates when their usefulness is over." These women are known to kill family members solely for financial gain including pension money, insurance claims, and other financial benefits. This is achieved through executing husbands, lovers, and children.


 * Angels of Death
 * Sexual Predators
 * Revenge Killers
 * Profit Killers