Chauncie Billie Felix was last seen on February 1, 1988, in San Marcos, California, and was later reported missing. Her disappearance is now recorded in the National Missing and Unidentified Persons System as NamUs MP149587, which lists her full name, place of last contact, and the date she was last seen. The NamUs entry was created on September 3, 2025, bringing her case into a centralized federal database for wider public visibility.

The public profile contains only foundational details and does not include descriptive information such as clothing, distinguishing features, or items she might have been carrying. Decades have passed since her last confirmed sighting, and the recent NamUs listing preserves her name in official channels so new tips can be connected to the case. If anyone knew Chauncie, saw her in San Marcos around February 1, 1988, or has information that could help, please contact the appropriate law-enforcement agency or the California Department of Justice hotline.