James MacArthur, Danno from ‘Hawaii Five-O’, dies at 72

James MacArthur, the man who was Danno to Jack Lord’s Steve McGarrett on the 1970s television police drama Hawaii Five-O, died in Florida today, according to his agent.

Although he had a long career on stage and screen, it was MacArthur’s work playing Danny “Danno” Williams on Hawaii Five-O that resonated with the public.

Many of the show’s episodes ended with the two detectives finally snaring their perpetrator — and McGarrett spitting out the signature line, “Book ’em, Danno.”