Uncover the true story behind the devastating terror attack in this gripping and emotional CNN Original Series. | CNN Original Series

Was this a terrible accident or a callous murder? How It Really Happened investigates the Oscar Pistorius case - Sunday at 9p ET/PT on CNN. | CNN Original Series

Frederick Fleet, who survived the Titanic sinking, called down and said, “Iceberg dead ahead.” How It Really Happened with Jesse L. Martin investigates the Titanic in a special two-hour episode Sunday at 9p ET/PT on CNN. | CNN Original Series