I must say, if you love serial killer TV shows, movies, and documentaries, Netflix has got your fix on the serial killer bug.
Of course, we have to start with TV shows, and with that: Criminal Minds, CSI: Miami, CSI: New York, Bones, Dexter, The Killing, and The Following. Then, we have a variety of documentaries: Carl Panzram, The Jeffrey Dahmer Files, Serial Killer Culture, CNN's Crimes of the Century, Catching Killers, and Forensic Files Collection.
Then, of course, there are movies. Silence of the Lambs, Along Came a Spider, Zodiac, and Se7en.
My personal favorites have been the documentaries by John Borowski: Carl Panzram and H. H. Holmes: America's First Serial Killer. The movies listed above are also favorites, along with the TV shows Criminal Minds (the original series, not the spin-off--that's an entire blog post where I'll dedicate for that) Dexter, and The Killing.
There are also various movies on individual serial killers Ed Gein, Jeffrey Dahmer, Henry Lee Lucas, Richard Ramirez, the Hillside Stranglers, Richard Speck, Ted Bundy, David "The Son of Sam" Berkowitz, and Aileen Wuornos. Just to name a few.
So, as you can see, there is much to choose from if you have an itch for serial killers and you have Netflix.