that was marysville mayor jon nehring.t and retired atf special agent and hostage negotiator pop as always your perspective is good when it comes to something like this and answering the questions of why. jim, earlier today police confurmd a cafeteria worker tried to stop the student as he was firing and confirm that the weapon that the shooter used was a .40 caliber gun. in your experience what is the police investigation look like today, day two? >> well, they're going to be tracking that gun which i think they tracked back so far, looking at his computer, getting oughtle information, frances, off his computer to find out what he was thinking, what he was doing, twitter, facebook, computer discs, they're going to talk to all his friends, his family. we call it a psychological workup or psychological autopsy of what he's been doing in the last few months to see if there's any event and let me tell you, teenagers there's always events so we all live through those years, all the pressures on you and they'll find the pressur