John junior

This was the one fight they could never seem to get to the bottom of.

“He loved her,” Carole Radziwill recalls of John F. Kennedy Jr.’s marriage to Carolyn Bessette. “And she loved him. And they drove each other crazy.”

Take a look back at the relationship between the late political heir and actress.

John F. Kennedy Jr. died on July 16, 1999, in a plane crash that also killed his wife and her sister. Here, friends remember the man behind the famous last name

Photos: On this day - July 16, 1999 - John F. Kennedy, Jr., dies when his plane crashes into the Atlantic

Carole Radziwill was the daughter-in-law of Lee Radizwill, marrying her son Anthony in 1994. The former RHONY star writes about losing John Kennedy Jr and his wife Carolyn in a plane crash.

Carolyn Bessette-Kennedy's friends open up to PEOPLE about what she was really like

John F. Kennedy Jr. died on July 16, 1999, in a plane crash that also killed his wife and her sister. Here, friends remember the man behind the famous last name

She was a witness to the creation of "Camelot" and a confidante to JFK Jr.

Well before his plane went down, the political scion felt he and wife Carolyn Bessette might be spiraling out of control. Friends give a look at the pair's last days together.