I read through the story, not as a fan of stars, and their family, but as to why this happened. The one thing I caught in the write up is that the father, some Casey dude, has been her boyfriend for "years"?

Shes 16 for shits sake! Where are the parents in monitoring a 12 year old dating some one?

That is assuming if she started dating when she was 12, or 13 ("years" ... 16 - 2, 3, or 4 years = 12, 13, or 14).
The parents need to be flogged as far as Im concerned. When (more likely if) my daughter starts dating, I'll make sure the suitor knows of my extensive knife/gun collection and my five acre plot of land with PLENTY of places to hide bodies ...