where i was going, i had no idea. >> before his killing spree, roger kibbe was an avid skydiver with more than 4,000 jumps. once he began killing, he used parachute cords to choke several of his victims. >> one of the interesting things of kibbe's background is his experience as a skydiver. what he no doubt discovered is he could get a rush from jumping out of the plane. the difference between those that are psychopaths and those that are not, psychopaths don't experience the normal level of anxiety as something scary is about to happen. but once the scary things happen, they have a sudden rush of sensation. it's quite unfamiliar to that, so it can become highly addictive to keep doing the thing that suddenly evokes an emotion that's generally absent. >> so the position you had her in to tie her was face down, at which point you tied her wrists together behind her back using the parachute cord, and then you rotated her body so that her face is towards the rear of the van? >> no. let me back up. what i stupidly did, i got on the freeway to go back over the martinez bridge, and it hit m