another national forest homicide, this one in north carolina. >> so theb you've got to be saying to your team of vectors, what do we have here? >> that's right. >> now we're wondering who we really have here and where is he? and, more importantly, where's meredith? do we have a killer running around loose in the national forest? >> concerned for meredith deepens, but her friends know something that man on the mountain couldn't. >> a blue belt in akeyed dough and a blue belt in judo. if anyone could survive, it was meredith. >> when "dateline" continues. hey, who are you? oh, hey jeff, i'm a car thief... what?! i'm here to steal your car because, well, that's my job. what? what?? what?! (laughing) what?? what?! what?! [crash] what?! haha, it happens. and if you've got cut-rate car insurance, paying for this could feel like getting robbed twice. so get allstate...