I've almost never found a corpse in any of my tanks - but I don't keep any big fish. If you don't see it later today I don't think you ever will!!
As long as the tank's not tiny, it probably won't matter at all, although, as previous posters said, if you do see it, better to take it out.
Maybe if you don't see it, just don't feed for two days to compensate?
M