We also have to keep in mind that he most likely wasn't thinking straight, so he may not have chosen the path we would think. If he'd had time to think about it he may have left her elsewhere. Like I said once before, he may have wanted to do things quickly thinking he might have time the next day to go and 'fix things'... not knowing the police would be watching his every move. I agree, panic & shock would have to have set in. And he isn't bright at the best of times, let alone after murdering his wife.