Timothy Treadwell was an American bear enthusiast, environmentalist, amateur naturalist, eco-warrior, and documentary filmmaker and founder of Grizzly people. He lived with the grizzly bears of Katmai National Park in Alaska for 13 summers.
At the end of his 13th summer in the park in 2003, he and his girlfriend Amie Huguenard (October 23, 1965 – October 5, 2003) were killed by a 28-year-old brown bear, whose stomach was later found to contain human remains and clothing.
Treadwell studied grizzly bears during summer seasons for 13 years before being devoured by them. According to his book, Among Grizzlies: Living with Wild Bears in Alaska, his mission to protect bears began in the late 1980s after surviving a heroin overdose. He claims in his book that his drug addiction grew from his alcoholism.