family. the best way to help the decedent at this point is to remain objective. >> on this day, her job is clear cut. >> we want to determine the cause of death. in a case of a gunshot wound case, we're going to recover the bullet or bullets. the posterior aspects -- >> whatever she finds will be turned over to investigators. >> my role is to do a complete examination, to gather all of the physical evidence that i can, to document that physical evidence to the best of my ability and by doing so, that allows the victim to tell me the story and then i should tell the story to those people who have the right to know. >> dr. corey finds that the victim's wounds provide clues, clues that will help investigators determine a key detail -- how close the gun was to the victim. >> we can, by looking at the skin surface, get an estimate as to how far away the muzzle was