And if there was, I think Darin let him in the front door. I also have a thought that the cut screen at the garage could have been done for a different reason, to let him back IN. Who knows, he could have murdered the kids, tried to kill Darlie as well, ran outside through the front door (Darlie said she remembers it being unlocked for some reason) and hid the clothing and came back in the screen at the back without Darlie seeing what he did. This would only work if she had slept through the whole attack, which is so impossible to think....Or one other thing is possible, that she may have talked him into the murders, and into mutilating her as well. I don't know, but I can not see Darlie cutting her neck like that, with the necklace stuck in there, that would have taken some force.