>> 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 nights up here.