this was the moment bonnie's mother, karen campbell, had prayed for.gonizing wait for justice was far from over. here is keith morrison. >> all that was left was collecting a memory, bits and things that reminded them of how good she was, how thoughtful. the school paper she was to have turned in, she read it to her sister the night before. it was an english paper about saying goodbye. >> saying goodbye to her friend, katie and saying goodbye to her biological father was never really a part of her life. saying goodbye to cameron as he went away for college. it was like she knew. >> something was broken and could never be fixed, but this new huge news that the dna matched a one-time bus driver who moved to davis, california. they called karen as soon as the results come in. >> you get excite and think wow -- >> this is the guy. >> they retested 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 cont

. >> karen campbell, anchorage. >> reporter: she told her media friends it was murder, the troopers didn'twhat they were doing. >> you're not going to get away with it. >> reporter: she gave a slew of interviews, included samantha in this one. >> she wouldn't have taken a ride, not from a stranger for sure. >> there was nothing accidental about it. >> reporter: but initially it did look like an accidental fall to one of the troopers, the one who happened to be the first to talk to karen. but the others saw the evidence and thought, murder. one trooper at the crime scene was tim hunier, now retired. >> one thing strange to us, we did find one drop of blood on a leaf at the top of the cliff. >> reporter: one drop of blood. >> one drop of blood. >> reporter: which was found by this man, trooper robert beatty, also now retired. >> i was on my hands and knees and was looking and came across that drop of blood. >> reporter: how big was this drop? >> about the size of an eraser head really. the interesting part about that was that it was a drop that had fallen straight down. >> reporter: indicati