How Yosemite serial killer chose his fourth victim

Former FBI Agent Jeff Rinek recalls the moments Cary Stayner approached 26-year-old Joie Armstrong at her cabin in an area of Yosemite National Park in 1999.
1:17 | 01/24/19

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Transcript for How Yosemite serial killer chose his fourth victim
Terry Gainer is down here in this area he machines up agreeing happen. This Pitt team blind. Girl in the event approaches. She's putting things in and out of her truck he comes closer. And has he comes closer she is. What he thinks he wants something instantly changes with Kerry's thinker and he's ready to kill again. Just like at first murders he goes back to his truck gets his murder. He gets out his backpack these guys have gone to these guides duct taped he's got a night. He's standing. Somewhere in this vicinity talking to house and he's making conversation. Was a guy who. It is strong and athletic and asks. Movies are when she's. He would his village a little hotter but as he's talking to her about bigfoot is trying to look behind to care whatsoever shoulder season tonight. And pretty quickly it would've gone flat fare. There change. Oh wolves. It.

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

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