Yup, that is what they said in their OS. HOWEVER, there are clues that they are now going with a more aggressive case against George. They have consultants, like LKB and Janie W. who are out on the media tour. And these 'consultants' are floating the theory that George was framing Casey. They imply that he put the duct tape on her little face,l then kept it in the home on purpose, even used it on camera from news station filming him. They imply that he changed her clothes, putting the wrong size shorts on, before putting her in the trunk to frame Casey. They have to go with the 'framing' scenario because no one would believe an ex cop would do all of those stupid things unless it was a frame up.
They cannot go with the old accident story because everyone laughed in their faces.