Not sure if it has been posted here before, but http://www.darkdocumentaries.com/category/serial-killer-documentaries has some outstanding videos.
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I recommend watching the one on Paul Benardo and Karla Homolka, and then the interview with Paul Benardo from jail in 2007. It's amazing watching a convicted multiple rapist and murder talk about how he doesn't like being portrayed in the media as a liar because they think he gave false information about a couple of rapes.
I still can't believe she's free and has a family. Just ridiculous.
I'm interested in a lot of these crimes, but what actually went on as far as Karla Homolka is concerned is something I'd like to know more than any other. Not the investigation, but her crimes.