I shudder to post this, and something perhaps even more sinister. She could have aroused, saw a perp, or her brother, with Haleigh on the couch as reported Jr. says, Haleigh already dead and they threatened her and little Jr. I'm leaning more towards the brother, because if it was a stranger perp, and Misty awoke to find the crime in action, I believe they would have murdered Misty, incapacitated, harmed or took her too.
So going with this theory, if it was the brother, he wouldn't necessarily murder Misty for catching him. She's probably not told on him in the past for a siblings lifetime of wrongs. He may also have a sick incestual lust for Misty, if, I repeat if, there is any truth to Misty's comments about "He messed with her". I base this on a spritual truth I know as a Christian. A spirit of lust can't be quenched, so why would he murder his object of affection and lust that's served his perversions in the past? I'm going to put a disclaimer above my post, this is graphic, I apologize.