Claudette Colvin, the civil rights pioneer who refused to give up her seat on a segregated Montgomery bus months before Rosa Parks, died Tuesday from natural causes, according to the Claudette Colvin Legacy Foundation. She was 86.

Colvin was 15 years old on March 2, 1955, when she defied a bus driver’s order to surrender her seat to white passengers while riding home from school. Her arrest did not immediately spark a boycott, but it became a critical piece of the legal and moral challenge to segregation in Montgomery.

Police arrested Colvin, charged her under Montgomery’s Jim Crow segregation laws, and placed her on probation. Years later, she said she remained seated because she was thinking about the Constitution and the rights she believed belonged to her as an American citizen.

“This nation lost a civil rights giant today,” said Tafeni English-Relf, Alabama state director of the Southern Poverty Law Center. “Claudette Colvin’s courage lit the fire for a movement that would free all Alabamians and Americans from the woes of southern segregation.”

Despite her early act of defiance, Colvin was never elevated as the public face of the movement. Young and outspoken, she was later judged by standards not applied to adult activists, and she lived much of her life outside the spotlight as the movement gained national momentum.

Her role, however, proved pivotal.

Colvin was one of four plaintiffs in Browder v. Gayle, the federal lawsuit that reached the U.S. Supreme Court and struck down bus segregation laws in Montgomery and across Alabama. The ruling dismantled the legal framework that had made her arrest possible.

Phillip Ensler, who later helped clear Colvin’s criminal record, said her case became foundational to the legal fight against segregation.

“In 2021, it was the privilege of a lifetime to serve on the legal team that helped Ms. Colvin clear her record from the conviction,” Ensler wrote.

Ensler said he spent time with Colvin while preparing the court motion, hearing firsthand how her teenage act of resistance became a cornerstone of lasting change.

Leaders across the country reflected on Colvin’s passing and her long-overlooked place in civil rights history.

“Today we lost an unsung yet significant hero of the civil rights movement,” Sen. Rev. Raphael Warnock of Georgia said. “Her courage paved the way for Rosa Parks’ decision and the launching of a movement that would end segregation.”

Illinois Gov. J.B. Pritzker said Colvin’s impact was undeniable, while Bernice King said her life serves as a reminder that progress is shaped not only by defining moments, but by sustained courage and truth.

Colvin did not seek recognition. But her refusal to move—at just 15 years old—helped force the nation to confront segregation, leaving a legacy history is still learning to fully acknowledge.