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The Giggling Granny eventually admitted to all of the murders.
Woman On Killing Spree To Find the Perfect Husband
Still, she was only tried for the fifth husband's murder. She served less than 10 years of her life sentence before dying of leukemia.

She didn't get her chilling nickname until she started talking to the authorities about how she killed her husbands, giggling all the while. She said that she was driven by the dream of finding a perfect husband.

To me, the creepiest part about Nannie Doss' many murders is the fact that she got away with the spree for so long, despite being the common denominator in each death.