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                               Meg, 
                              The Church  does not have a teaching on the exact moment when the soul leaves the body (not  even doctors can agree on a solid definition of death), so She cannot answer  your question.  
                              You may,  however, enjoy this experiential (not Church teaching) look at near-death  experiences from a Catholic faith perspective: 
                              
Given  what we've learned experientially from near-death experiences, it seems likely  to me that the soul left the body on Day 1, since people who have NDEs tend to  do so after a cardiac event like this. 
Eric |