The original Danno on Hawaii Five-O died in Florida of natural causes on Thursday. He was 72. MacArthur, who was the son of Helen Hayes and playwright Charles MacArthur, was at the other end of one of TV’s most famous lines: “Book’em Danno” was the order whenever his TV partner Steve McGarrett (Jack Lord) caught the bad guy. Scott Caan currently plays Danno in the CBS remake of the original, which ran from 1968-1980. MacArthur was also in several Disney films, including Swiss Family Robinson and Kidnapped.