It’s not possible for him to receive the death penalty for these charges, the max is 20 years per count. On top of that, the fed doesn’t have the death penalty anymore, as far as I understand.
That being said, it is very possible he will go to prison in some fashion. Of course he will never be with the gen pop, but just because he has an SS detail doesn’t mean he can’t go to prison. Also, it could be possible to strip him of the detail, but I’m pretty sure that will be figured out if the time comes.