If Admiral Yamamoto survived WW2, what would have been his fate at the war crimes tribunals?

Yamamoto opposed the invasion of China, the alliance with Germany and Italy, and going to war with the USA and European powers. As far as I know, he did not take part in the atrocities committed in places occupied by the Japanese army.

Nonetheless, he was the one who orchestrated the sneak attack on Pearl Harbor, so he would have been at the top of America's shit list. Would he have been imprisoned or maybe executed?