I've been fascinated by the story since I first read it back in the day and I think it was also well represted in the excellent film starring Kirsten Dunst and Ryan Gossling. In fact, Robert Durst is perhaps the one role that Gossling was born for since it requires being an unlikable and cardboard acting style that only Gossling (or maybe Keanu) could pull off.
Give the show a watch if you're a fan of crime docs. Good stuff.