Mary Flora Bell -- England

This eleven-year-old girl caused a sensation in 1968 when she 
killed two small boys in Newcastle-upon-Tyne. 


http://www.crimelibrary.com/classics/bell/3.htm

http://www.crimelibrary.com/criminology/kidkill/

Book: "Cries Unheard"

(Barnes and Noble)

http://news.bbc.co.uk/hi/english/uk/england/newsid_1935000/1935076.stm