Mary Tsoni, the Greek musician who starred as one of the unnamed siblings in director Yorgos Lanthimos’ acclaimed breakthrough film, Dogtooth, has died. The tabloid Espresso reports that Tsoni was found unconscious on Monday in her apartment in downtown Athens after calling for an ambulance. The cause of death remains undetermined. Tsoni was 30.

Born in Athens, Tsoni studied dance in London before pursuing a career in music as one half of a duo called Mary And The Boy. Though the surreal Dogtooth—one of The A.V. Club’s favorite movies of the past decade—wasn’t her first film role, it brought her to international attention. Tsoni played the youngest daughter of a factory owner who has raised his children to adulthood with no knowledge of the outside world, and she ended up sharing the Best Actress award at the Sarajevo Film Festival with Angeliki Papoulia, who played ...