Founding Dixie Chicks member Laura Lynch, 65, died in a car crash in El Paso, Texas.
Lynch played bass and sang with the all-women country music band for four years since its inception in 1989.
Chicks members Emily Strayer, Martie Maguire, and Natalie Maines expressed shock and sadness on Instagram.
The Chicks' representatives have not yet responded to NPR's request for comment.