The Oscar-nominated actor's casket will be on public view on Sunday from 9 a.m. to 12 p.m. at the Hall of Liberty at Forest Lawn Memorial-Parks and Mortuaries in Los Angeles.
A private service is scheduled to follow on Monday.
"The Green Mile" star died Monday in Los Angeles after complications from a heart attack July 13. He was 54.
Duncan worked as a bodyguard before beginning his acting career in his 30s. In addition to "Green Mile," he also appeared in "Armageddon," "The Scorpion King" and "Sin City."