Sacheen Littlefeather, an American entertainer and extremist who left a mark on the world when she declined the Oscar for the benefit of Marlon Brando, passed on at 75.

The Foundation of Film Expressions and Sciences reported her demise on Monday in a post shared on Twitter.

While no reason for death was promptly given, Littlefeather unveiled in a Facebook post in January last year that she had metastasized bosom malignant growth.

Littlefeather left a mark on the world when she stepped in front of an audience at the 1973 Oscars for "The Guardian" star Brando,

who chose to blacklist the honor service in fight at the depiction of Local Americans on the big screen.

Brando was additionally responding to government policing to the control of the South Dakota town of Injured Knee by individuals from the Native American Development.

Her short discourse, for which she wore a buckskin dress and shoes, was met with a combination of boos and commendation.

In August, the Foundation officially apologized to Littlefeather for the abuse she encountered during her discourse and in the years that followed.

A letter from previous Institute President David Rubin to Littlefeather said the maltreatment she got through was "inappropriate and uncalled-for."

Describing the apology as a “dream come true,” Littlefeather said: “We Indians are very patient people – it’s only been 50 years!