Carole Radziwill Opens Up About Cousin JFK, Jr. & Carolyn Bessette's Plane Crash in New HLN Special

'The Real Housewives of New York' star recalls her final phone call with her close friends just before they boarded the plane. 'How It Really Happened with Hill Harper' airs Friday, March 10, at 9 p.m. ET on HLN.