marked the center of the bullet hole and then followed the bullet's path. it showed that the shooter was firing from a standing position. >> clearly few people shoot holding the gun up over their head, and if you realize their body was interposed between that, we only have a few feet to deal with. so it can't be a standing man, for example. it could be a collapsed man or a person nearly down on the floor. >> next, ballistics experts examined the bullet fragment found on the floor of the camper and discovered what was called soft damage. >> it deforms in a different way than it would if it hit wood, concrete, drywall, metal, and it slows down. the longer the path through a victim or tissue or a tissue simulant, the more life is lost. >> to find out whose tissue was in the camper, they sent the sample for dna testing, but they didn't have the body to compare it to.