It was on this day in 1973 that the death of his son, Alexander, led Aristotle Onassis to his tragic downfall less that two years later.

Callas had a longtime affair with Greek shipping tycoon Aristotle Onassis ... via the back door so Kennedy doesn't see her. "Even in death, I was the secret," Callas recalls.

"Maria" also includes flashbacks of Callas' glory days as a performer and her relationships with her husband and manager Giovanni Battista Meneghini and her lover Aristotle Onassis. Onassis ...