If this case doesn’t end up being prosecuted, I don’t think it’s going to at the hands of LE. Unless there’s some kind of confession or strong, credible corroborating witnesses, they need to find her body. You can dig up quite a few cases from KY where evidence seems pretty overwhelming as far as guilt is concerned but they’ve not been charged. In most of those cases, the victim hasn’t been recovered. I can think of 5 in just the last few years that I’ve followed.