Norma Jeane Mortenson adopted the name and persona of Marilyn Monroe when she began modelling as a teenager in Hollywood. She would become one of the most recognizable movie actresses of her time, but also have affairs with very famous and powerful men. When she was found dead of an apparent overdose, the coroner concluded it was suicide. Based on eyewitness testimony and autopsy analysis, it could have been murder. But if she was killed, who did it and why?