Eyak was once spoken in south eastern Alsaka on the Cooper River. It is a member of the Athabascan-Eyak branch of the Athabascan-Eyak-Tlingit language family. The last traditional speaker, Chief Marie Smith Jones, died on 21st January 2008. There is one other fluent speaker though - Dr Michael Krauss, a linguist and anthropologist at the University of Alaska Fairbanks and founder of the Alaska Native Languages Center who learnt the language from Eyak people and has documented it.
The language was a victim of the spread of English, and also of Tlingit
Information about the Eyak language
http://en.wikipedia.org/wiki/Eyak_language
http://www.uaf.edu/anlc/langs/ey.html
http://redzone.org/index.php/eyak_preservation_council/eyak_language/
Apache, Chipewyan, Eyak, Gwich'in, Hän, Navajo