Marilyn Monroe: accidental overdose? Suicide? Or Murder?

Can you site your sources or provide some insight that is fresh and unique? I have heard, read and seen only a couple of credible things about murder, and while I think the suicide / accidental overdose scenario holds up it does so only to a point With the mob, the Kennedy Family, Hollywood Studios, Sinatra, the FBI, all involved simultaneously in her life (and in that era) isn't it at least possible she was murdered and that it was done cleverly?