The star of "The Green Mile" and "Armageddon" died Monday, nearly two months after suffering a heart attack. He was 54.
The Los Angeles Times said a public viewing of his casket is scheduled for Sunday at the Hall of Liberty at Forest Lawn Memorial Parks and Mortuaries in the Hollywood Hills.
An invitation-only service will be held Monday at an undisclosed location, the Times said.
Duncan is survived by his mother, Jean; sister, Judith; and fiancee, reality television personality Omarosa Manigault.