sentences:  In all, he served from March 4, 1925, until his death in 1952.Cox died of a heart attack on December 24, 1952, between his victory in the 1952 general election and the start of the 83rd United States Congress.Although Cox was a frequent critic of the administrations of Roosevelt and Truman, their coattails often provided Democratic majorities in the House that allowed Cox to chair powerful committees, particularly in his later years.