liam mcatasney, himself. >> i planned this thing out for like six months. >> a hushed courtroom, urgedhe car parked by the beach. >> i choke her out, drag her. >> the word, disturbing doesn't begin to describe. >> so you just count up -- just without working? >> she was like screaming in? >> here, in anthony's car, liam told the whole sickening story of what he did to sara on december 2nd. they were alone in her house, that afternoon when liam crept up from behind then grabbed her. >> i pretty much hung her, like -- i just, a picked her up and then i had her dangling off the ground. and then she said my name and that was it. it took me half an hour to kill her. i thought it was going to be able to track her out and have her out in like a couple of minutes. that's the only time i had my phone. who and it took me like a half an hour after i hit start. on the timer. >> you heard that right, liam used his phone to time how long it took for sarah to die. she was helpless. not even her faithful buddy intervened. >> her dog laid there and watched as i killed her. didn't do anything. her [blee