GREAT FALLS, Mont. (AP) -- The U.S. Fish and Wildlife Service says it is offering a reward for information leading to the conviction of whoever illegally shot one of Montana's largest grizzly bears.

The carcass of the bear called Maximus because he stood 7 1/2 feet tall and weighed about 800 pounds was found Aug. 12 on a ranch in northern Montana. The bear had been dead about a month.

Special Agent Brian Lakes says he didn't know the exact size of the reward but it would be "substantial."

Lakes says he is also investigating two other illegal shootings of grizzly bears.