Chilcotin is an Amerindian language belonging to the Athabaskan family. Athabaskan
languages are characterized as prefixing languages with rich morphological agreement. They are also categorized as tone languages, although historically they were not. I propose that by using an autosegmental framework to analyze tone in Chilcotin the stem tone alternations will become predictable. Two basic autosegmental rules: spreading and tone deletion, can account for the stem tone alternations.