She is the widow of the real Don Draper, who died in Korea. The
current Don Draper was born Dick Whitman; he assumed Don Draper's
identity after the war. He divorced Anna but continues to have a
friendship with her. She is dying of cancer.
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He snooped in Don's office and found the box that contained war
photos and papers with Don Draper and Dick Witman's true
identities.
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Betty Draper, the wife of "lead role" Don Draper (, played by
Jon Hamm).