personality disorder. and these individuals absolutely have no remorse. they don't really have moral development. and often times what we notice in the brains of the individuals they have very low reactive, reactivity, that means they have to do something so incredibly exciting to be able to get the kind of spike in the brain that normal people would get from eating a good meal or nice piece of chocolate. what we see in the individuals they will often times kill for the tlichhrill. it would not surprise me that they find the killer that this person has had a pattern of other crimes already. it is all going to come together in that way. this is how they actually achieve the mood stability that most of us have from doing daily things. >> yeah, such a violent crime. is this a krocrime of passion? likely done by someone who knew her or a stranger? >> i think it is mostly in terms of the research what we know it is not a complete stranger. usually an acquaintance or