Frank Bellotti, a political heavyweight in Massachusetts heralded as the man who transformed the state’s Attorney General’s Office, died Tuesday at 101, his family said in a statement.

Massachusetts political figures and other luminaries on Tuesday mourned the death of former state Attorney General Francis X. Bellotti, a towering public servant who fought for civil rights. For decades a major presence on the city and state’s legal and political scenes, Bellotti was 101.