To elaborate a little, the shot was quartering away. I aimed for ahead of the right ham & behind the ribs, as she was angled away and uphill. The arrow entered just where I wanted, and took (?kidney) both lungs and heart. The tip of the broad head just barely pierced the skin alongside the brisket between off shoulder & neck area.
I always count after the shot to see how long it is before the critter tips over. In this case it was 3 seconds. We heard gurgling almost immediately after the sound of the impact, and she tipped over about 40 feet from point of impact.
I was amazed that the arrow did not exit, but then examination of the teeth showed that the incisors were worn almost to the gum line. Age was estimated at 20-25 years. Tough old girl with hard bones!