Rangers in Wyoming's Grand Teton National Park were unable to determine if speed was a factor in the recent vehicle strike that killed a sub-adult grizzly bear on a park highway. The 5-year-old male bear,

Grizzly No. 1058, one of Grizzly No. 399's four cubs, was fatally struck in Wyoming’s Grand Teton National Park. The deceased bear's body was discovered on Tuesday, May 6.

Grizzly bear 399 was hit and killed by a car on Highway 26/89 in Snake River Canyon south of Jackson, Wyoming, in October, McClatchy News previously reported. The 28-year-old mother grizzly was the oldest known reproducing grizzly bear in the Greater Yellowstone Ecosystem.