Nannie Hazel Doss

Life Insurance poisoner, four husbands, two sisters, her mother, 
two of her children, and one grandchild, and a nephew.

Dubbed "The Giggling Granny" because she laughed while confessing
her crimes.  Sentenced to life in prison, died in prison.

   "I never heard of Richard Morton...Oh, that Richard Morton!...
   Yes, I was married to him."--Nannie Doss, Oklahoma woman who
   murdered eleven people, including four of her five husbands
   (including Richard Morton).


http://darkday.tripod.com/a-h/doss.html

http://www.crimelibrary.com/serial6/doss/

http://members.tripod.com/~sherby/index3.html

http://members.tripod.com/~dark_star_3/womenkillers.html