Reclusive and one of the first on record in modern times.
http://www.allserialkillers.com/jack_the_ripper.htm

Could be the sickest non dictator in modern times.
http://www.youtube.com/watch?v=5uhmtAmwnDQ

Its always astonishing what a person is capable of.
http://www.youtube.com/watch?v=RkfIpMRfNzc

Andrei Chikatilo: The Rostov Ripper Andrei Chikatilo confessed to 56 murders when he was eventually caught in 1990. The brutal killer preyed on children and young vagrants, eating intimate parts of their bodies.

Another twisted maniac.
http://www.youtube.com/watch?v=N3szsOUF-o8

David Berkowitz was a truly insane individual.
http://www.allserialkillers.com/david_berkowitz.htm