Which American Professional boxer who retired in 1981 is interviewed for the 2009 documentary Facing Ali?
Facing Ali: Facing Ali is a 2009 documentary directed by Pete McCormack about Muhammad Ali (born Cassius Marcellus Clay, Jr. in Louisville, Kentucky) as told from the perspectives of some of the notable opponents he faced during his career: George Chuvalo, Sir Henry Cooper, George Foreman, "Smokin'" Joe Frazier, Larry Holmes (a former sparring partner of Ali), Ron Lyle, Ken Norton, Earnie Shavers, Leon Spinks and Ernie Terrell. Ken Norton:  Norton also fought a slugfest with Larry Holmes in 1978, narrowly losing a split decision.
Ken Norton