It won’t be first degree murder but probably manslaughter or reckless conduct. His gun was legal so they can’t call him on that he was licensed to carry it.
The Anthony case got messed up because of the first degree charge that just would not stick to that woman. But the DA will come up with something that will stick. If he is found guilty and serves any time is another thing. I am not sure he will because it is taking place in Florida….again.