According to the "Knoxville Sentinel" and the link below at Knoxnews.com officials at the Great Smokey Mountains National Park had to euthenize a black bear after it bit a photographer. See the details at the link below.
Following an investigation by Park Rangers, the photographer has been charged with interfering with and molesting wildlife. It was discovered that the photographer approached within one foot of the wild bear to get a close up. The bear reacted to this threat and bit what appeared to be an overly aggressive human on the foot.
The bear was put to death due to a park policy that any bear that causes injury to a human will be destroyed.
Learn more about being safe around wildlife and what you can do to help protect them in National Parks in my book "A Park Ranger's Life: Thirty Two Years Protecting Our National Parks."