Timothy Treadwell (April 29, 1957 – October 5, 2003) was an American bear enthusiast, environmentalist, amateur naturalist, eco-warrior and documentary film maker. He lived with the grizzly bears of Katmai National Park in Alaska, USA, for 13 summers. At the end of his 13th summer in the park in 2003, he and his girlfriend Amie Huguenard were killed and partially eaten by a grizzly bear. Treadwell's life, work, and death were the subject of the 2005 critically acclaimed documentary film by Werner Herzog titled Grizzly Man.