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