This is correct. 1st degree means "premeditated" murder. meaning the person had to have planned out the murder in some capacity. The pharmacist did not in anyway "plan" to kill someone when he woke up that morning. And the mitigating circumstances of the robbery and reasonable fear of his own life certainly dont make it murder in any way shape or form. The state should wise up and charge him with manslaughter in some form, no jury in Oklahoma is going to convict him for murder.
There is no way this case goes to trial as first degree murder. The DA is probably trying to scare the pharmacist into taking a manslaughter plea.
Anyone with one eye and half an asshole can see that the pharmacist's actions were not premeditated. (I always wanted to use that phrase.)