It is אסור to kill a גוי but there is no מיתת בית דין for one who does. Let us say that someone sends a mail bomb to kill a certain גוי [G-d forbid]. In the meantime, the גוי is מתגייר. Then he gets the mail and BOOM!!!
Is the sender liable for killing a Jew or a גוי?
On one hand he sent it to a גוי. On the other hand, this same גוי received the bomb as a Jew??!!
What is the din?