Yellowstone National Park authorities will not try to capture a female grizzly that killed a backcountry hiker because the bruin was trying to defend its cubs when it was surprised by the man, a spokesman said Thursday.

The mauling of Brian Matayoshi, 57, of Torrence, Calif., was a purely defensive act, park spokesman Al Nash said. He added that Yellowstone typically does not try to capture or remove a bear in what he called “a wildlife incident.”

It was the first fatal grizzly attack inside the park in 25 years — but the third in the Yellowstone region in just over a year