>> if i wanted to ensure that no one would associate the dog with her, i would have killed the dog. but there's no way i could do that. >> he was toofrp much of a sofo kill the dog, he explained it. but poor meredith, ella's owner didn't have a chance. >> i just told you once you've done it, you're either going to kill her or get caught. there's no other solution. if that sounds cold and cruel, yeah, it was. >> in his unbelievably cold recollection of the crime, hilton said he told meredith he was going to let her go after four days of captivity. >> i told her i'm taking her, i'm going to release her. >> instead hilton went to the van, came back with a tire iron and bludgeoned meredith emerson to death. in an attempt to thwart investigators, he decapitated and poured bleach over the body. >> this is gruesome beyond belief. >> yes. >> for what reason? >> i don't know. >> hilton confessed to killing