In my opinion, they can and should move forward with charging him with Jessica's murder and any additional charges for her case. They are probably trying to determine cause of death, but they know the manner of death is homicide. I don't think they will delay charging him because they are waiting for identification of the other body. These cases remind me so much of Morgan Harrington and Hannah Graham. One monster and two innocent victims separated by years. It took Hannah's murder to solve Morgan's case as well. I think Jessica will do the same in these cases. They can move forward with her case and follow up with Kara's when the other body is identified.