What gets me about this story, aside from the obvious horribleness of it, is this quote:
"In Nixzmary's case, there had been warning signs, but ACS officials said the family was uncooperative."
Huh! You don't say--investigating a crime, and the suspects are not feeling too forthcoming? Well, then heck--why even try to continue the investigation? I guess I would have thrown in the towel, too. After all, the only way we can investigate crimes is when the suspects cooperate.