After the death of Hollywood starlet Marilyn Monroe in 1963, the FBI launched an investigation into numerous alternative theories about her overdose on sleeping pills. The probe focused on speculation that the sex symbol killed herself after a married man with whom she was having an affair broke off their relationship. The probe also sought to disprove rumors that the "right-wing" agents of the FBI and CIA or the Mafia had an interest in Monroe's death as a means of embarrassing Robert F. Kennedy, who was also reputed to be having an affair with her.