Rachel Dolezal's resignation from her job yesterday as president of the Spokane, Washington chapter of the National Association for the Advancement of Colored People came as her parents, who are white and says she is too, urged her to seek counselling.
The Washington state chapter of the NAACP posted Dolezal's resignation letter on its Facebook page.
In it, she writes that her commitment to the "racial and social justice movement" is undiminished but that "the dialogue has unexpectedly shifted internationally to my personal identity in the context of defining race and ethnicity."
She rose to become the president of the city's branch of the NAACP and served as an independent mediator for the city's police force.
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Neither position required that she be black, but media reports said Dolezal identified herself in application forms and in various public appearances and writings as black.
Leaders from the city of Spokane said in a statement they were "disappointed" over the episode and "the alleged misrepresentation."
Dolezal apparently resigned under pressure from the NAACP.
"I have always deferred to the state and national NAACP leadership and offer my sincere gratitude for their unwavering support of my leadership through this unexpected firestorm," Dolezal wrote.
Since the story went national, last week they have provided local media with a birth certificate and photographs of Dolezal as a blonde, fair-skinned child.
Now, as an adult, she is tawny-skinned and dark-haired.
Several US media outlets reported Dolezal sued historically black Howard University in 2002 for racial discrimination because she was white.
The suit was apparently dismissed and Dolezal holds a master's degree from the school in the US capital of Washington.
Speaking on ABC News, prior to the resignation, parents Lawrence and Ruthanne Dolezal said they were baffled by what their daughter has done.