http://www.dailymail.co.uk/news/article-2088456/JFK-Jrs-assistant-reveals-torment-urging-Carolyn-Bessette-board-ill-fated-flight.html
Carolyn wanted a normal life. With John in the limelight, she could not have that and their marriage was strained. By faking his death, he could provide that for both himself and his wife and any children they might have. Plus, he could eventually investigate in anonymity his father's death.>>1883933