The filmmaker, whose doc was meant to be lighthearted and shine a light on President Volodymyr Zelensky, was also the longtime producing partner of Robert Rodriguez.

Aaron Kaufman, an Emmy-winning writer, director and producer, died on Thursday evening in Las Vegas after suffering an apparent heart attack. He was 51. Kaufman's death was confirmed by Chad Verdi, the film financier behind "The Irishman" as well as several of Kaufman's past and upcoming projects.

Aaron Kaufman, the Emmy-nominated director behind 'Superpower,' Sean Penn's doc about the Ukraine-Russia war, has died at the age of 51.