one of them was the daughter of another bus driver. i'm talking 14-year-old girls. >> reporter: oh, boy. >> he was a substitute teacher but got fired for some of the things he was saying in his classes. >> reporter: apropos of young girls. >> yes. and he left the area and moved down to california. >> reporter: the troopers went looking and found him in davis, california. >> we flew down there to try to talk to him. >> reporter: could this be him, the man who raped and murdered bonnie? could the hunt finally be over? they got his dna. >> it came back that he was the individual involved in bonnie's death or that he had sex with her. everybody was happy, everybody was ecstatic. >> reporter: you got your guy. >> we got our guy. >> reporter: finally they had their man. but what it is they say? don't count your chickens. the dna match was everything bonnie's family was hoping for. it was hoping to deliver justice. coming up --