this guy fit the profile? >> he does. the serial killers generally fall into kind of the con man, slick ted bundy type. they get -- they answer ads and they are on facebook and they can make arrangements. if you remember, he wasn't being followed by police. it wasn't apparent that he was a serial killer. it is a just he happened to be caught. they have what is the cooling off period. it separates them from mass murderers and spree killers who kill everyone at once or spree killers in succession. they will kill, dispose of the evidence, move on maybe geographically. they are very hard to catch. i remember ted bundy very well growing up. they are more psychopath than mentally ill. >> here's the question then that i'm sure most people want to know. how exactly do you treat a serial killer? >> you can't. >> what you do, we treat serial killers who are mentally ill, we