Who visited Marilyn the day before she died?

Like many an iconic figure who have gone to their graves young, the events leading up to Marilyn's death are as mysterious, ambiguous and unclear as Marilyn herself. Many people supposedly visited Marilyn the day before she died - Bobby Kennedy, the FBI, a mob boss and Frank Sinatra's rat pack.

This part of the puzzle seems to be shrouded in mystery but we know one thing - Marilyn's close contact with the world's most elite and powerful meant that she knew things and had information. Did somebody not trust Marilyn and want her dead?

Film: Marilyn Monroe In Korea