Helene Jegado 

Helene once complained, "Wherever I went, people died." 
Started as a domestic, later entered a convent, then
left the holy life and became a domestic again.  
Wherever she went -- she poisoned people.  Credited with
23 victims -- one more than Ted Bundy.

Died on the Guillotine.


http://www.mayhem.net/Crime/serial.html

http://www.bookrags.com/books/ssacc/PART6.htm

Non-English sites:

http://www.chez.com/follenn/bjegado.html

http://opiniao.sapo.pt/sH5/113061.html