This one is an old one:
http://www.charleyproject.org/cases/m/marshal
Little girl goes missing and supposedly the kidnapper contacts the parents years later. It was featured on unsolved mysteries. Then her mother is murdered in Mexico like a few years after the airing on unsolved. What's strange is that there is nothing out there about the mother's murder. I've searched online, and can't find any news articles about it. Is there anyone from Mexico that's heard of this case? Why was the mother in Mexico? From what I've read the authorities don't think it was connected to Nyleen's disappearance. . .but then why was she there? Vacation? downward spiral?
A good summation of the case can be found on this Youtube channel. . .
She tends to sum up a lot of these cases pretty well. . .