with what the sheriff said last week that he didn't think this could be carried out by just one person alone of the it's interesting that they have yet according to law enforcement have seen him with anybody else. >> that's not a contrast to me, anderson. i understand what he's saying. when you go down the road in this investigation your fist response has to be before we assume that nobody else is involved, we have to look at every avenue. that's sort of the default. this is a curious case. let's go through three stages. stage one is chaos. a day or two in this sort of fog of war, what happened here. stage two is acquisition of data. that is interviews with people like friends and family, the girlfriend, acquisition of data. and you're going to assume in that acquisition of data and in those interviews you're going to find a motive, politics, sex, money. now we're in stage three and we're realizing maybe the motive was some internal demon that this individual might have reacted to after decades of absorbing whatever that internal