mass shootings in history. anna ka brar ra has more information. >> we've heard from college professors, now we're hearing from the accused killer himself. in a videotaped meeting, it's evidence that gets right to the heart of the case. the question of sanity. appearing calm and speaking in a steady monotone voice, the words of accused killer james holmes has projected an image. >> do you remember when you were arrested? >> zble what day was that. >> july 20, 2012. >> for the jury it was a brief look into the mind to determine whether holmes was really sane when he opened fire in a kroet movie thighs ter. >> do you take into consideration he knows that he's facing the death penalty?