investigators crawled over his daughter s car. and that morning, frank gave the first of what would be many, many interviews. we were hopeful when we found the car things would fall into place and maybe they will. reporter: this interview, though, was one frank just couldn t get through. you know it occurred to me that i haven t cried in a long time. i ve learned how to do that. that s it. reporter: firefighter robert thomason helped with the arson investigation. you can see that the glass itself was all burned out and you can see where it s still kind of intact over here. it was really obvious to see that more intense was on the driver s side. reporter: meaning that s where the fire started. that s where the arsonist wanted to be sure to erase evidence. under the car, damaged skid plates and strands of wild grass caught in the suspension, meaning somebody had driven off