Transcript for Sister survivors of 'Golden State Killer' speak out: Part 6
Unsolved murders became an obsession. I need to see his face. He loses power when we know his face. Reporter: Michelle Mcnamara's book ends with a hope that one day, a killer would be unmasked. She would have been thrilled. She would have been immediately looking through her files, Reporter: She passed away in here sleep a little over two years ago before she could see the arrest of Joseph Deangelo. One day soon you'll hear a car pull up. You'll hear foot steps up your front walk. This is how it ends for you. Open the door. Show us your face. Walk into the light. It's been 42 years, I carried a backpack of feelings of revenge, of hate, of course, of shame for a long time. I no longer carry that. I don't want them to be remembered this. Now they might be remembered as the link that solved the case. Indeed. This is indeed a game changer, because every law enforcement department in the country, or maybe in the world, just realized the power of genetic genealogy. I've kept a big binder of information, just so I could be able to answer questions over the years. I can burn it all. It'll be gone. Reporter: What is the most important thing that you want people to remember about this story? I want people to remember the victims. You know, everybody's gonna be talking about the rapist, but the victims are the most important part of this story. Reporter: Jane Carson is now an advocate for rape survivors like herself. Speaking out at rallies like this one last Friday night. I have been a hot mess, I have been an emotional roller coaster. You've got to make your mess a message. You can't let it destroy your
This transcript has been automatically generated and may not be 100% accurate.