Yes, that's true. But from the article, I gather that there weren't signs of forced entry or robbery. So investigators very likely suspected that the victim kn

Yes, that's true. But from the article, I gather that there weren't signs of forced entry or robbery. So investigators very likely suspected that the victim knew the murderer. And so mom and step-dad were likely on the short list. Also, they'd still have seen his car in the video. And they knew when she stopped showing up at work.