black widow
Colloquial term for a woman who kills multiple spouses or partners, typically for financial gain such as life insurance payouts. Not a formal legal classification but widely used in media, law enforcement operations, and court documents.

Definition
"Black widow" is an informal term used in criminal justice and true crime contexts to describe a woman who murders or arranges the murder of multiple spouses, romantic partners, or close associates, typically motivated by financial gain such as insurance proceeds or inheritance. The term derives from the black widow spider, whose females sometimes consume their mates after reproduction.
In US federal criminal law, "black widow" has no statutory definition and does not constitute a separate criminal offense. When such cases are prosecuted in federal court, charges are brought under standard federal statutes covering murder, conspiracy to commit murder, wire fraud, mail fraud, or insurance fraud, depending on the specific circumstances and jurisdictional basis. The term functions as a descriptive label for a pattern of criminal conduct rather than a legal classification.
The designation appears in official legal documents and court opinions as a descriptive identifier. For example, US District Court documents from the Middle District of Florida refer to Judias Buenoano as "the Black Widow" in proceedings related to her conviction for murdering her husband and other victims for insurance money. The term has also been adopted as the operational name for law enforcement investigations, as evidenced by the US Department of Justice's "Operation Black Widow," demonstrating its use as investigative nomenclature rather than legal terminology.
In true crime literature and media coverage, the term is applied more broadly to cases involving women who systematically kill intimate partners or family members for personal gain, regardless of whether federal charges are involved. The label has become a cultural shorthand for this particular criminal pattern, though it carries no formal legal weight and serves primarily as a colloquial descriptor for investigative, prosecutorial, and narrative purposes.
Related entries
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The Dena Thompson Case — The Black Widow Murders
Dena Thompson, known as 'The Black Widow,' was convicted of murdering her husband Julian Webb in 1994 through poisoning at their Sussex home after targeting men through lonely-hearts advertisements.
The Thomas Randolph Case — Nevada's 'Black Widower' Murders
Thomas Randolph was convicted of murdering his sixth wife Sharon Causse and hired hitman Michael Miller in a staged home invasion in Las Vegas, 2008.
Ivan Milat: The Backpacker Killer Who Haunted Australia
Between 1989 and 1992, Ivan Milat murdered seven backpackers in New South Wales, Australia. Posing as a helpful driver, the construction worker picked up hitchhikers on the Hume Highway before transporting them to Belanglo State Forest, where he killed them in a series of brutal attacks that shocked the nation.
Related articles

The Black Widower: The Six Wives of Thomas Randolph
HBO Max docuseries about Thomas Randolph, a Nevada man convicted of arranging his sixth wife Sharon Causse's 2008 murder for $300,000 in life insurance — and killing the hitman.

The Dena Thompson Case — The Black Widow Murders
Dena Thompson, known as 'The Black Widow,' was convicted of murdering her husband Julian Webb in 1994 through poisoning at their Sussex home after targeting men through lonely-hearts advertisements.

The Thomas Randolph Case — Nevada's 'Black Widower' Murders
Thomas Randolph was convicted of murdering his sixth wife Sharon Causse and hired hitman Michael Miller in a staged home invasion in Las Vegas, 2008.
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Ivan Milat: The Backpacker Killer Who Haunted Australia
Between 1989 and 1992, Ivan Milat murdered seven backpackers in New South Wales, Australia. Posing as a helpful driver, the construction worker picked up hitchhikers on the Hume Highway before transporting them to Belanglo State Forest, where he killed them in a series of brutal attacks that shocked the nation.

Hinterkaifeck: Europe's Bloodiest Unsolved Family Murder
On March 31, 1922, six people were brutally murdered at the Hinterkaifeck farmstead near Munich, Germany. Their bodies lay undiscovered for four days. Nearly a century later, the case remains unsolved.