The visitor was hiking with his wife along the Wapiti Lake trail when he surprised a female grizzly bear with her cubs, the park service said. The bear attacked and fatally wounded the man in an attempt to defend her cubs.
A group of nearby hikers called police after they heard the victim's wife crying for help.
The superintendent of Yellowstone National Park said:
"It is extremely unfortunate that this couple's trip into the Yellowstone backcountry has ended in tragedy. Our heart goes out to the family and friends of the victim as they work to cope with their loss."
We share this sentiment.
This is the first bear-caused human fatality in Yellowstone since 1986, Nash said. Bear attacks are extremely rare.
[Image via WENN.]