Marvel declined to comment.
The film, directed by “Creed” helmer Ryan Coogler, also stars Michael B. Jordan, Danai Gurira, and Lupita Nyong’o. Boseman will play T’Challa, the prince of the African nation of Wakanda, who must take over the mantel after his father’s murder. Marvel unveiled the character in “Captain America: Civil War” before the standalone film bows on Feb. 16, 2018.
In the comics, M’Baku was one of Wakanda’s most powerful warriors and one of T’Challa’s biggest rivals.
Joe Robert Cole is co-penning the script with Coogler. Kevin Feige is producing the movie.
Marvel had been testing several actors for the role over the past week, including “The Get Down” actor Yahya Abdul-Mateen II, before casting Duke. Duke is relatively new to the industry, having recently graduated from the Yale School of Drama. He had recurring roles on several TV shows, including “Major Crimes,” “The Messengers,” and “Person of Interest.”
He is repped by Abrams Artists Agency, Wenzel Entertainment, and Hansen, Jacobson, Teller, Hoberman, Newman, Warren, Richard, Rush & Kaller.