She was the alpha female of a wolf pack in Yellowstone National Park, sought after for photographs because of her unusual white coat.
Hikers found her suffering from severe wounds last month. The animal was euthanized by park staff shortly after.
The park now says the recognizable wolf suffered a gunshot wound, based on preliminary results of a necropsy by the U.S. Fish and Wildlife Service. The animal likely was shot sometime between April 10 at 1 a.m. and April 11 at 2 p.m. on the north side of the park, near Gardiner, Mont.