BILLINGS, Mont. -

The U.S. Fish and Wildlife Service is offering a $1,000 reward for information leading to the conviction of whoever is responsible for killing a grizzly bear in the Gallatin National Forest, likely over the Memorial Day weekend.
    
Hikers found the grizzly bear carcass near the Cache Creek and Taylor Fork roads about 14 miles south of Big Sky.
    
Federal wildlife investigators are hoping someone in the area heard shots or saw suspicious activity.
    
Grizzly bears are protected under the Endangered Species Act, so killing one is a federal offense.
    
Anyone with information about the shooting should contact USFWS law enforcement at 406-427-7355 or to the state Department of Fish, Wildlife and Parks at 1-800-TIP-MONT (800-847-6668). Callers may remain anonymous.