Koyo Kouoh, one of the global art world’s most prominent figures, who had been slated to become the first African woman to curate the Venice Biennale, died on Saturday in Switzerland. She was 57.

Her death was confirmed by the biennale’s organizers. The announcement did not cite a cause or say where in Switzerland she had died.

The biennale said that Ms. Kouoh’s “sudden and untimely” death came just days before she was scheduled to announce the title and theme of next year’s event. The statement added that her death “leaves an immense void in the world of contemporary art.”

The Venice Biennale is arguably the art world’s most important event. Staged every two years since 1895, it always includes a large-scale group show, organized by the curator, alongside dozens of national pavilions, organized independently.

A spokeswoman for the biennale did not immediately respond to a request for comment on what Ms. Kouoh’s death would mean for next year’s exhibition, which is scheduled to run from May 9 through Nov. 22.

As the curator and executive director of Zeitz MOCAA, one of Africa’s largest contemporary art museums, Ms. Kouoh built a global reputation as a torchbearer for artists of color from Africa and elsewhere, although her interests were global in reach. “I’m an international curator,” she said last December in an interview with the The New York Times.