>> the fbi's behavorial analysis has unleashed the reporting they've been doing for the last five years. i'm sure everybody has asked why so long? he's dead. no prosecution. this is really for historical benefit for the rest of us to look at the patterning here. what was so amazing about what they discovered is that they had to go deep and dark into his past, not just interviewing family, friends, associates, teachers, everybody who touched this guy's life. but also down into the internet and his connections there. they came up with this woman, unidentified, has had a 2 1/2 year relationship with him online. she was a trove of knowledge about what he had told her -- >> they never met. >> never met. but she said he was, quote, the weirdest person online. she said all of these things about how he was singularly focused on murder, mass murder. spree killings. if it didn't have to do with that, he wasn't interested. his musical interests, all about murder. he had a negative world view. he would wallow in it and