A look at brothers Steven and Cary Stayner's horror and heroism

"20/20" Extra: Steven Stayner was kidnapped and held captive for seven years as a child and became famous for his escape. His older brother Cary Stayner became known for murdering four innocent women.
3:30 | 01/23/19

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Transcript for A look at brothers Steven and Cary Stayner's horror and heroism
Formerly people years. Come to Yosemite from all around the world. Not Kevin Tan is a granite monolith that. You have to see at least once in your. It's deep and green and you can just get lost and there forever if you want to. I. It's a little bit smaller than stated her diamonds. A lot of linked. And listen me. It's patently. The assembly actually means that people who kill. Eventually six year old's body was found Thursday near Yosemite home and didn't this case it couldn't have been more true the mother and daughter were found dead. After disappearing from Yosemite National Park. And you never expect her so much terror have been in such. The beautiful. I've never been to Yosemite before the first time. I saw Yosemite was for this case three people have disappeared. At Yosemite National Park in California it never failed to amaze me. That you're in the best nature has to offer. Dealing with the worst. Aspect of me kind. It is asking. Her death so. Or can you imagine a fifteen year olds have terrified she must end. You could never are unmatched in something so. Heinous happening in and around Yosemite the bodies of two of the victims were found in the trunk of the car it never happened before egg and chances are it will. Never how. By the middle of march the worst possible that you city park naturalist was found decapitated. In a covered a lot of murder stories. And this one has affected me in Iowa and just shakes you to the core. Here's another twist in this story as suspect's brother and a serial killer. No national park is a story. But there is more to this story. Because you missed your killer whose brother international celebrity twenty years ago America got to know Stevens to enter because of his tragic life because you've been kidnapped. And held captive for seven years Palmer said street corner in 1972. When he was just seven years old. This case attracted the interest of every single media and to keep it you can think up. Books. Television. Movies it was absolutely incredible yet Stephen. Clearly victimized innocence. On the other hand yet Carrey's Jeter. Who. Was evil incarnate. You have two Brothers are both tied to the assembly the odds of this happening within. One family that just makes you. Shake your head you have two Brothers bonded died July. But still one deep lingering question. Did somehow those experiences. Of the younger brother. Influence the maniacal behavior of the oldest.

This transcript has been automatically generated and may not be 100% accurate.

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