about victims in crimes like this. i assumed they lived off the grid and that no one was looking for them. in fact, their families had been looking for months and one for three and a half years. one for two years. >> that was the family whose daughter melissa's initial disappearance in 2009 was followed by multiple phone calls to her 15-year-old sister, amanda, by someone who claimed to be her killer. >> the calls come in from melissa's phone. this is quite jarring because she's been missing. and you see her caller id come up. and her 15-year-old sister answers. >> he was taunting her. he was basically torturing her. she kept asking where her sister was and he just wouldn't tell her. she would ask if she was alive. he wouldn't answer. i mean, we always had hope until