From a strictly legal perspective, it will be interesting to see how this new wrinkle plays out, especially with respect to spousal privilege. My understanding, based on years of watching Law & Order, is that a wife can't testify against a spouse regarding that spouse's words. That said, if she drove him there knowing his intent, that seems the deeds of a pretty straightforward accomplice.
"It does me no injury for my neighbour to say there are 20 gods or no god. It neither picks my pocket, nor breaks my leg."
-- Thomas Jefferson