Great Smoky Mountains National Park officials euthanized a 60-pound female black bear Thursday afternoon that attacked a hiker and ended up becoming an Internet cause celebre. Wildlife biologists determined the young bear that park rangers captured May 13 bit the foot of an unidentified man who got too close with a camera as he was hiking along the popular Laurel Falls Trail the day before. Park spokeswoman Nancy Gray said park policy dictates that all animals who attack humans must be euthanized. The bear was put down "in a humane manner," according to a National Park Service news release Thursday.