I had the oddest thing happen the other night and I since I've never had a vampire die before I was wondering if this was the norm.
After she died there was a small pile of something left that I'm assuming was ash. When Grim arrived he did the same motion the Sims make when they clean up laundry piles and put the ash in a bag. Of course the other Sims in the house were all gathered around so Grim, still holding the bag, had the thought bubble they get when they can't go somewhere. Finally Grim got through, went up the stairs, and dropped the bag in the dinning room and went out the door. You could almost feel the "what am I doing with this?" that Grim seemed to be thinking. It was so odd it made me laugh.