DNA tests underway to confirm captured cougar attacked bikers

Authorities are investigating why a cougar attacked and killed a mountain biker outside of Seattle
1:02 | 05/21/18

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Transcript for DNA tests underway to confirm captured cougar attacked bikers
We turn this evening to the deadly cougar attack near Seattle. Two bikers desperately trying to escape. Here's ABC's will Carr. Reporter: Tonight, scientists performing DNA tests on this cougar, after the cougar was caught looming over a mountain biker's body. Caller is reporting that his friend was attacked by a mountain lion. Reporter: On Saturday, the bikers encountering the 100-pound predator on this hiking trail outside Seattle. Initially scaring the cat off, but the cougar doubling back, pouncing on Isaac sederbaum. He said he had his whole entire head in the jaws of the animal and was being shaken around. Very, very horribly. Reporter: Amazingly, the mountain lion let sederbaum go, chasing down his friend, who ran into the woods. Authorities putting down the predator. DNA tests will now verify if this was the killer, and why the cougar attacked. They suspect the dangerous animal was slightly emaciated. David, cougar attacks are rare, but sightings have increased. Warning signs are being posted. Experts warn if you encounter a mountain lion, the last thing you want to do is run.

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

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