Hmmmmm.....

Two layer dark chocolate cake. Make rectangular hole in upper layer, use dark brown icing to hold layers together. Ice entire outside of cake with grass green icing. Except for the hole, of course. Droop a little bit of green icing at edges of hole. Use one of those over the hill grave marker candles. Voila! Empty grave!

That's as close to 'death' as I can get without looking for anything special. If you wanted to you could make a little coffin that opens with the former age inside, or something like that for in the hole.