metallic spheres found all over mandy's skin and clothing. the scanning electron microscope identified the spheres as carbon steel. from his experience, palenik knew precisely what had shaped the metal in this way. >> using a high-speed cutting tool to cut through steel, you will produce these spheres. the metal particle is raised to high enough temperature it actually melts into the spherical form. >> the metal spheres were compared to fragments found on the seat of smithart's truck. >> the particles were consistent in all aspects of having originated from mr. smithart's environment. it would be extremely unlikely to have all those particles come together just by chance somewhere else. >> now armed with forensic evidence, investigators wanted to learn as much as they could about smithart's background, so they flew to california to interview one of his daughters. there, they found evidence that mandy lemaire wasn't his first victim.