The real JFK Jr.

John F. Kennedy, Jr. attends a benefit for the Jackie Robinson Foundation Scholarship Fund, March 8, 1999 at the Waldorf Astoria in New York City.

Getty Images/George De Sota

Nearly 20 years ago, RoseMarie Terenzio started as the executive assistant to John F Kennedy Jr., and quickly became his publicist and closest confidante.

She worked for him until his tragic death in the crash of the small plane he was piloting in 1999.

Terenzio has penned a book about JFK Jr., called "Fairy Tale Interrupted: A Memoir of Life, Love and Loss."

She sat down for "Morning Coffee" with "CBS This Morning: Saturday" co-hosts John Miller and Nancy Cordes and gave her insider's perspective, sharing several stories about what her boss John was like outside the public eye.

She says she "told it like it was" to him. "I always did, and I do now. .. I think he loved that, because I didn't have the same idea of his fame that other people had. he was just there, and I saw no reason not to tell him how I felt."

What was his marriage like? Where would he be now had he lived?

To see the interview, click on the video in the player above.