Fueling the public’s decades-long fascination with the former first lady, "Jackie: Public, Private, Secret" reveals never-before-shared secrets about her life. WATCH NIGHTLINE EPISODES: abc.go.com/shows/nightline ALSO AVAILABLE ON HULU: hulu.tv/2wSmSrZ #nightline #jackiekennedy #jacquelinekennedyonassis #kennedy #politics #abcnews