saying good-bye to cameron as he went away to college. it was almost like she knew something. reporter: something was broken in the family, could never be fixed, of course. but then there was this news, huge news that the dna matched a one-time bus driver who had moved on to davis, california pap the troopers called karen as soon as the results came in. you get excited. you think, wow. reporter: this is the guy. yeah. then the bomb hit. reporter: the bomb. the bomb. they had some new dna system out. they retested it. and turned out it wasn t him. reporter: ouch. no one could believe it. reporter: back at square one. back at square one. then dealing with karen again. reporter: karen ramped up her campaign to keep bonnie s case in the public eye. bonnie s mother karen campbell continues her own crusade to find her daughter s killer. she remains unsatisfied with the investigation. reporter: the attention brought in tips. troopers tested more than 100
strange things about this guy. he had several reports about him trying to pick up young girls. one of them was the daughter of another bus driver. and he would fill in for the regular driver on bonnie s bus route. and we just found out from strange things about this guy. he had several reports about him trying to pick up young girls. 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
reporter: something was broken in the family, could never be fixed, of course. but then there was this news, huge news that the dna matched a one-time bus driver who had moved on to davis, california the troopers called karen as soon as the results came in. you get excited. you think, wow. reporter: this is the guy. yeah. then the bomb hit. reporter: the bomb. the bomb. they had some new dna system out. they retested it. and turned out it wasn t him. reporter: ouch. no one could believe it. reporter: back at square one. back at square one. then dealing with karen again. reporter: karen ramped up her campaign to keep bonnie s case in the public eye. bonnie s mother karen campbell continues her own crusade to find her daughter s killer. she remains unsatisfied with the investigation. reporter: the attention brought in tips. troopers tested more than 100 dna samples. and nothing came of it but frustration. the case grew cold, as cold as some of the winter night
former city bus driver. and he would fill in for the regular driver on bonnie s bus route. and we just found out from strange things about this guy. he had several reports about him trying to pick up young girls. 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 s
it was almost like she knew something. reporter: something was broken in the family, could never be fixed, of course. but then there was this news, huge news that the dna matched a one-time bus driver who had moved on to davis, california pap the troopers called karen as soon as the results came in. you get excited. you think, wow. reporter: this is the guy. yeah. then the bomb hit. reporter: the bomb. the bomb. they had some new dna system out. they retested it. and turned out it wasn t him. reporter: ouch. no one could believe it. reporter: back at square one. back at square one. then dealing with karen again. reporter: karen ramped up her campaign to keep bonnie s case in the public eye. bonnie s mother karen campbell continues her own crusade to find her daughter s killer. she remains unsatisfied with the investigation. reporter: the attention brought in tips. troopers tested more than 100 dna samples. and nothing came of it but frustration.