26 of The Most Dangerous Female Criminals The World Has Seen Till Date

16.  K.D Kempanna aka Cyanide Mallika

Murdered people by poisoning them with cyanide.
K.D Kempanna is a serial killer who murdered almost six people in Bangalore by poisoning them with cyanide. From 1999 to 2007, she used to pretend to be a godwoman and convinced her 'devotees' to meet her at secluded spots after which she would poison and rob them. In April 2012, she was sentenced to death for the same which was later reduced to life imprisonment.