Although the death of the legendary actress Marilyn Monroe was explained as a suicide, there were many hidden facts behind what they call one of the most controversial ends of a celebrity. The controversy stated name of famous icons including the then president John F. Kennedy and his brother Robert Kennedy.

Excerpt from:
http://www.crimelibrary.com/notorious_murders/celebrity/marilyn_monroe/9.html?sect=26

There are a number of credible people who claim that Marilyn Monroe had affairs with one or both Kennedy brothers. John Kennedy, at least, was known to indulge himself in extramarital adventures. So, it is not at all implausible that President Kennedy availed himself of the charms of one of the sexiest and most attractive women of that era. That Robert Kennedy was so inclined is not nearly as clear.

What allegedly became so troublesome was Marilyn's supposed rage at JFK's rejection of her and the fear that she was able to strike in both brothers. Donald Wolfe sums it up: "Marilyn Monroe was in a position to bring down the presidency. She was cognizant of Jack Kennedy's marital infidelities and other private matters. She had his notes and letters and was privy to Kennedy's involvement with Sam Giancana. That the Kennedy brothers had discussed national security matters with the film star added to an astonishing array of indiscretions."

Did that Robert Kennedy bring Marilyn the news of his brother's desire to break off his relationship on the night Marilyn died (Proable Suicide!!)? After all, there are some witnesses, including a cop, who place Robert Kennedy near the scene that night. This information may never be known with any certainty, but if Robert Kennedy did somehow make an unannounced visit to Marilyn Monroe on the night of August 4, then it provides unexpected motivation for the suicide theory. That is, while Marilyn may have been in good spirits that day and evening, a visit by Robert Kennedy shattering her notions about an enduring relationship with the President could have abruptly changed her mood.

Was there an attempt on the part of the government to cover up the President's indiscretions with Marilyn Monroe? It would be very surprising indeed if there were not such an attempt.