>> leita nobles still suffers from the poisoning. to this day, she has trouble walking. >> yes, i get angry sometimes. i get to thinking about it, and at first, i couldn't talk about it. i'd just go to crying. i just couldn't talk about it. >> now, scientists all over the world can test cremated remains for various substances. thanks to the hard work and dedication of the scientists involved in this case. >> people sit around trying to think of the perfect crime. and one could say that he nearly did commit four nearly perfect crimes, and there were just a few mistakes. >> i'm not a chemistry major, but i just felt like i hate to lose and i hate to see someone get away with a crime and so it just happened to work out, and i