MONTGOMERY, Ala. (AP) — Claudette Colvin, whose 1955 arrest for refusing to give up her seat on a segregated Montgomery bus helped spark the modern civil rights movement, has died. She was 86. Her death was announced Tuesday by the Claudette Colvin Legacy Foundation. Ashley D. Roseboro of the organization confirmed she died of natural causes in Texas. Colvin, at age 15, was arrested nine months before Rosa Parks gained international fame for also refusing to give up her seat on a segregated bus.