How so? JFK Jr, his unpopular wife Carolyn, and her sister died more than a year before the election. It was Giuliani's cancer and messy divorce that cleared the way for her. She might have beaten Giuliani even if he had run. He didn't become a 'hero' until later.
if you'd like the full force, double wrap tin-foil alert story.. just ask. ;)
Also, in JFK, Jr's magazine, he had just run an unflattering article about hillary.