walked away. it s like a shock. reporter: corbin dates came within inches of holmes. the night of the shooting still haunts him. he has no reason to come into court looking like he has a sad face. it s all right. the look he has now is not something that is going to be believable by anyone. reporter: holmes defense will attempt to convince a jury he was suffering from a psychotic episode at the time of the shooting. the district attorney will point to things like his boobytrapped apartment laced are explosives and ominous package mailed to one of his college prefers as preheadtation for the attack. perhaps the most important question in the trial is the mental health of james holmes. he has undergone insanity evaluation but those are sealed.