<Tr> <Th> Cause of death </Th> <Td> Fatal bear attack </Td> </Tr> <Tr> <Th> Occupation </Th> <Td> Environmentalist Naturalist Documentary filmmaker </Td> </Tr> <Tr> <Th> Years active </Th> <Td> 1990--2003 </Td> </Tr> <P> Timothy Treadwell (born Timothy William Dexter; April 29, 1957--October 5, 2003) was an American bear enthusiast, environmentalist, documentary filmmaker, and founder of the bear - protection organization Grizzly People . He lived among 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 were killed by a 28 - year - old brown bear, whose stomach was later found to contain human remains and clothing . Treadwell's life, work, and death were the subject of Werner Herzog's critically acclaimed documentary film Grizzly Man (2005). </P>

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