Actress and activist Sacheen Littlefeather has passed away. She was 75.

A statement from the celebrity’s caretaker shared that she died at noon Sunday and was surrounded by her loved ones when she passed away at her home in Novato, California, according to The Hollywood Reporter.

The publication recalled that Littlefeather revealed her stage 4 breast cancer diagnosis in March 2018. She is said to have later shared that it had metastasized in the years following.

News of her passing first emerged on Sunday night.

THR noted that The Academy of Motion Picture Arts and Sciences made it known via social media.

Sacheen Littlefeather took the stage at the Oscars in 1973 and delivered the rejection speech of Marlon Brando after winning the Best Actor award for his performance in “The Godfather.”

THR said that the late actor, who passed away in 2004, declined to accept the award and boycotted the ceremony as a protest against the treatment of Native Americans in the film and television industry. The decision is also noted to be a tribute to the then-ongoing occupation at Wounded Knee.

The publication continued that the then-26-year-old actress did not hold the trophy, noting that Brando gave her the instruction. It is also stated that she had received an eight-page speech from the actor, but the event’s producer told her she had no more than a minute to deliver it to the audience and viewers.

Days later, though, the New York Times published the “Godfather” star’s entire speech.

Sacheen Littlefeather received a mixed reaction from the audience at the awards ceremony. While some applauded, others booed her as she made her remarks.

As for the public sentiment, alongside the media, shortly after she took the stage, it is said to be “largely negative.”

About 50 years later, the Academy of Motion Picture Arts and Sciences' then-president, David Rubin, apologized to Sacheen Littlefeather on the organization’s behalf. She received a letter in June, and made it public two months later, according to Entertainment Tonight.

The outlet said that the letter expressed the Academy’s regret over the aftermath of what occurred at the 1973 Academy Awards. It also noted that the organization praised her speech, as well as the impact it had.

In a statement to Entertainment Weekly, Littlefeather shared her thoughts about the letter she received from the Academy.

The publication quoted the activist from her statement, saying, “Regarding the Academy’s apology to me, we Indians are very patient people - it’s only 50 years. We need to keep our sense of humor about this at all times. It’s our method of survival.”