When we think of serial killers, the image that typically forms is of a cold,
calculating man—someone like Ted Bundy or Jeffrey Dahmer. But history
tells a more complex story. Contrary to common belief, female serial
killers are not only real, but some have been among the most prolific and
psychologically troubling murderers ever documented.
While their methods often differ from their male counterparts—typically
using poison, suffocation, or starvation rather than overt violence—the
psychology of control, manipulation, and detachment remains strikingly
similar. In this chapter, we explore some of the most infamous women
serial killers in history and unpack the deadly minds behind their crimes.
Mary Ann Cotton – The Black Widow of England
• Country: United Kingdom
• Active Years: 1852–1872
• Estimated Victims: At least 21 (some estimates up to 30+)
• Method: Arsenic poisoning
• Motive: Financial gain via life insurance and pensions
• Final Fate: Hanged in 1873
Psychological Profile
Mary Ann Cotton represents the archetype of a manipulative and
emotionally detached female killer. Her crimes were methodical and
profit-driven, showing no sign of emotional conflict. Traits observed
include:
• Calm demeanor in the face of death
• Lack of remorse or emotional connection to victims
• Calculated, instrumental violence
• Skilled use of charm and deception
She likely suffered from antisocial personality disorder, evidenced by:
• Persistent lying and manipulation
• Exploitation of societal structures (life insurance)
• Emotional detachment, even from her own children
Childhood and Early Life
Born in 1832 in County Durham, Mary Ann experienced early trauma with
the death of her father in a mining accident. The resulting emotional
instability and poverty may have planted the seeds for her later behavior.
Despite appearing quiet and well-behaved in youth, she began a deadly
pattern of marrying, bearing children, and watching them die of suspicious
gastric illnesses.
Modus Operandi
Her weapon was arsenic—a slow killer that mimicked natural diseases like
typhoid. She:
• Moved frequently to avoid detection
• Took out life insurance on family members
• Nursed victims while poisoning them
• Exploited the medical ignorance of the time
Motive and Pattern
Her killings were cold and calculated, driven by greed. Victims included
husbands, lovers, children, and even her mother—anyone who could be
insured or inherited from.
She displayed psychopathic resilience, moving on quickly after each
death, often without mourning.
Legacy and Psychological Insight
Mary Ann Cotton's case is significant because it:
• Defied gendered expectations of violent crime
• Exposed cracks in 19th-century medical and legal systems
• Set a precedent for understanding female "Black Widow" killers—
those who kill for gain, not gratification
Elizabeth Báthory – The Blood Countess
• Country: Hungary
• Active Years: Circa 1590–1610
• Alleged Victims: About 80 according to trial testimony (legend
claims up to 650)
• Method: Torture, mutilation, murder
• Motive: Sadistic pleasure and obsession with youth
• Final Fate: Never tried; imprisoned in her castle until death in
1614
Psychological Profile
Elizabeth Báthory's case stands out as a rare example of sadistic female
psychopathy. She exhibited:
• Detachment from reality
• Complete lack of empathy
• Need for power and control over the powerless
• Organized, ritualistic methods of torture
• Note: any psychological profile of a historical figure is
speculative, and historians caution that the "blood bath" story
appeared long after her death
Background and Early Life
Born into one of the most powerful families in Transylvania, Elizabeth had
status, education, and influence. Rumored to have witnessed violence at an
early age, she married Count Ferenc Nádasdy at 15. While he was at war,
she began experimenting with punishment and cruelty, initially on
servants.
The Blood Legend
Although widely doubted by historians, the legend of her bathing in blood
reflects the unsettling intersection of:
• Obsession with beauty and aging
• Folkloric exaggeration rooted in real brutality
• Misogyny and class fear in historical recordkeeping
According to testimony gathered at the time (much of it by her political
rivals), she lured girls with promises of work, then:
• Tortured with needles, branding irons
• Starved and froze victims
• Bit and mutilated their flesh
Victim Profile and Capture
Her victims were mostly young servant girls. When girls of lesser nobility
were also reported missing, the crown intervened, and a royal investigation
gathered hundreds of testimonies.
Though never tried in court, Elizabeth was sealed in a chamber in her own
castle. She died four years later.
Legacy and Psychological Insight
Elizabeth Báthory is one of the most mythologized female killers—part
legend, part reality. She reflects:
• The psychological dangers of unchecked power
• Female violence masked by aristocratic privilege
• Early examples of sadistic female serial murderers, whose cruelty
rivals that of the worst male killers
Amelia Dyer – The Angel Maker
• Country: United Kingdom
• Active Years: 1860s–1896
• Estimated Victims: 200 or more infants (only a few bodies were
recovered)
• Method: Strangulation, neglect, starvation
• Motive: Profit through baby farming
• Final Fate: Hanged in 1896
Psychological Profile
Amelia Dyer was a highly organized, profit-driven killer with chilling
disregard for life. Traits include:
• Manipulation and fraud
• Systematic cruelty toward helpless victims
• Absence of guilt or remorse
• Likely suffered from borderline or antisocial personality traits
Her victims—newborn babies—were viewed not as lives, but as business
transactions.
The Baby Farming Era
In Victorian England, "baby farming" was a common (and legal) practice
where women took in illegitimate children for a fee. Dyer turned this into
mass murder by:
• Advertising to adopt babies
• Accepting payments from desperate mothers
• Killing the infants almost immediately
Modus Operandi
Her methods evolved over time:
• Early: sedated babies with laudanum, leading to death by
starvation
• Later: manual strangulation with white tape, her signature
• Bodies were dumped in rivers, wrapped in cloth or carpet
• She moved towns and changed aliases frequently to avoid
detection.
Motive and Pattern
Dyer's motive was pure greed. She maintained a respectable appearance
while murdering hundreds. Most victims were days or weeks old—some
killed within hours.
Capture and Trial
A baby's body found in the River Thames led to her arrest. Authorities
discovered mountains of evidence, but no living children. The jury took
only minutes to convict her. She was executed in 1896, showing no
remorse.
Legacy and Psychological Insight
Amelia Dyer's case reveals:
• How poverty, desperation, and social failure can be exploited by
predators
• That female killers, even in caregiving roles, can be capable of
immense cruelty
• That societal assumptions about women's nurturing nature can
blind investigators to evil hiding in plain sight
Her case led to stricter child protection laws in the UK and remains one of
the deadliest in recorded history.
Conclusion:
Women Can Kill—And Do
Female serial killers may not receive the same media attention as male
murderers, but their psychological complexity and brutality are equally
haunting. Whether driven by greed, sadism, power, or delusion, these
women challenge the assumption that violence is inherently masculine.
Their stories are a reminder of the psychological spectrum of evil—one
that is not bound by gender but defined by pathology, trauma, and human
darkness.