By miraculously finding her body.
I agree. He’s lost his patience with the investigation and is craving the attention and spotlight on him by her body being found. This desire for attention, and the anger that still remains from whatever triggered him to kill her, is making him take unnecessary risks (‘finding’ her when he’s known where she was long ago), but he can’t help himself in my opinion.
It’s actually a good thing that he seems to crave the attention, and believes himself to be 10 steps ahead of them; that’s what will catch him out in the end. If he had kept his head down and not constantly made himself front and centre he might have got away with it. But then Ian Huntley couldn’t help himself either......
He’s
so bleeping pleased with himself that he got away with it, but for people like him it’s almost meaningless unless other people are aware of his brilliance. It will be a relief for him when he can finally shout it to the world, but of course that relief will come with the price of being caught and punished.
He’ll be caught; it will just take time.