Catawba is one of two Eastern Siouan languages of the eastern US, which together with the Western Siouan languages formed the Siouan language family

Siouan languages

The Western Siouan languages, also called Siouan proper or simply Siouan, are a Native American language family of North America, and the second largest indigenous language family in North America, after Algonquian...

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Ethnologue reports that the last native speaker of Catawba died before 1960. Red Thunder Cloud

Red Thunder Cloud

Red Thunder Cloud , whose English name was Cromwell Ashbie Hawkins West and who was also known as Carlos Westez, was the last native speaker of the Catawba Indian language. His obituary was later published in this language in the New York Times...

, apparently an impostor born Cromwell Ashbie Hawkins West, claimed to speak the language until he died in 1996 (Goddard 2000). The tribe is now working to revive the Catawba language.