Rosa Lee Parks, whose refusal to give up her bus seat to a white man sparked the modern civil rights movement, died Monday. She was 92. Mrs. Parks died at her home during the evening of natural causes, with close friends by her side, said Gregory Reed, an attorney who represented her for the past 15 years. Mrs. Parks was 42 when she committed an act of defiance in 1955 that was to change the course of American history and earn her the title "mother of the civil rights movement."