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both samples were identical. scientists also found animal hair plaster. but this wasn't just any animal hair. the animal hair in the plaster found underneath wesley's body had something in common with the animal hair in the plaster from the renovated house. >> i was able to say that these were animal hairs that were from the same animal. they knew that they had the right residence. they knew that they had the right people. >> but the ultimate proof came from a piece of duct work from the basement floor. testing showed it contained a tiny speck of human blood. and dna testing left no doubt who the blood had come from. >> it ended up being the blood of wesley person. we had found our crime scene. we had the victim's blood there. >> investigators felt they knew who planned this attack.