Did Jackie Kennedy have an affair with Bobby Kennedy?

They were frequent rumors of this in the 1960s circulated by the tabloid press. Several authors, C. Heymann Wynn in particular, have written books that have alleged this affair. If anyone had the affair, it was Bobby, since he was a married man, while Jackie the recent widow. It is common knowledge that they were close to one another, especially in the period following JFK's death. Whether this closeness developed into a romantic affair is still up for debate, but for now is merely another rumor that surrounds the Kennedy clan.