In this spine-chilling episode of Murders, Mysteries, and Conspiracies, host Glenn P. Clinger III delves into the dark world of Black Widow killers and Bluebeard killers—men and women who used love, trust, and marriage as a deadly weapon. From notorious figures who lured their victims with affection to those who used deceit and betrayal to carry out their sinister plots, we explore infamous cases that shocked the world. What drives these killers to strike against their partners? And how did their reigns of terror finally come to an end?

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