DR KLEPP
It's a difficult issue, I've actually brought some references about it, that food is digested and undergoes digestion from the time one eats it.  In other words chewing food mixes it with saliva and the digestive process begins.  When it's in the stomach it continues to be digested.  There are however a number of factors which alter the digestive process, one of which, which is important to consider, is stress.  I don't know the circumstances of this death, but if for instance during the meal or shortly after the meal this man had been subjected to stress, in other words either verbal or physical, the whole digestive process would come to an end.
	We on occasion see people who had been lying in hospital for a week, still with stomach content in them because the whole movement of the stomach actually stops.  I'm not sure if that has answered your question, but it certainly would have been slowed down by a stressful situation and certainly when he had been shot, I would not have expected much movement out of the stomach into the intestines of food.