Lyda Southard was known as Flypaper Lyda, Lady Bluebeard, and the black widow.  She married several men and they all kept mysteriously dying.  It was eventually discovered that some of the bodies contained traces of arsenic poisoning and Lyda was the beneficiary on all of the life insurance policies.  She was eventually convicted of second-degree murder and sentenced to ten years, but she got a guard to help her escape.   Luckily, her next husband realized who she was before she murdered him.  He was able to set up a plan with the police, so they could catch her again.

Website: Drinking The Cool Aid

Resources:
Lyda Southard - Wikipedia

 Lyda Southard, Husband Killer (historichorrors.com)

 Lyda Southard Was a Serial Killer Who Terrorized Idaho (onlyinyourstate.com)

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