Cougar kills mountain biker, injures another

Isaac Sederbaum, 31, told police the cougar let him go before chasing his biking partner into the woods near Seattle.
2:05 | 05/21/18

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Transcript for Cougar kills mountain biker, injures another
Now to that rare and fatal mountain lion attack outside of Seattle. Two cyclists encountered it and gio Benitez has the story. Reporter: At first the two friends were able to tan their ground and make lots of noise, scaring the cougar away but as you're about to see the cougar came back and that's when it decided to attack. This morning, a rare attack near Seattle, a cougar killing one mountain biker and injuring another. The first initial call came in. He was just yelling for help. Reporter: The friends were biking down a remote road when a 100-pound male cougar began chasing hem? At one point one of the victims even swung their bike toward the animal as it approached and that caused it to run off. Reporter: Moments later it came back for the bikers and attacked. It launched on to him, latched on to his head. He said he had his whole entire head in the jaws of this animal. And was being shaken around. Reporter: 31-year-old Isaac sederbaum, an avid biker seen here on Facebook, survived the attack. He told police the cougar let him go before chasing his friend into the woods. Sederbaum badly injured biking nearly two miles to find cell phone reception to call 911. We have a second patient probably another five miles up north fork road, was being attacked at the time our patient got away. Reporter: Authorities later finding the cougar standing over the biker's body. The sheriff's office telling us the emaciated cougar was caught and killed. Just weeks before the attack. Steve mikael captured this cougar in the same area. I realize that, wow, there are things out here very powerful and this is their space. Reporter: And cougars weigh up to 140 pounds. They can run at speeds of 50 miles per hour. Attacks are rare but people have spotted them in Pennsylvania, Oregon and Wisconsin this month alone. So experts say if you see one in the wild, stay calm. Hold your ground or back away slowly but just do not run away. That's the most dangerous. Because they chase you. They're too fast. Okay, gio, thanks very much.

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

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