YOU don't really know if it is the KILLER that is taunting the family. What we seem to know is that someone that had the victim's cell phone is taunting the family. Why that person has that phone is another matter. There are a lot of nuts out there.
This is true. I don't know anything for certain. The phone could have been found and used by a third party to make those calls. But I highly doubt it. Why would someone do something like that? And at the time the calls had been made how would a third party who wasn't the murderer have known Melissa was definitely dead? Which, as it turns out, she most likely was. It's a stretch to say the least. Let's not forget that a lot of the information given by the caller, according to both the parents of the victim and their attorney, are being withheld so that in the future if more calls are made they can differentiate the false from the potential fact. In addition weren't certain details given that only someone who had been in close contact with Melissa would have known? There's a lot we don't know in general. We're all speculating here to some degree. There's been a lot of talk about the killer accessing the victims voicemail, but that's easy to do. I'm not sure that holds much water, or is even really relevant. But then again, we don't know what any potential stored messages may have revealed.