Watched movies, tv series, documentaries with/about serial killers. Mostly classic serial killers (3 or more victims in two and more separate events over a period of time). Sorted by recently watched. Check my Slasher killers list too.
Note: I've decided to add here story of Luka Rocco Magnotta (Don't F*** with Cats) even officially he's not a serial killer. You should watch this too.