An imposing, Britain-born player who initially set out to be a dancer, Walker turned to acting after an injury sidelined his career. In the '90s, he appeared on numerous TV series in his homeland before coming to prominence Stateside and earning a CableACE Award as a simultaneously sympathetic and scary Muslim leader on the HBO prison series Oz. During his tenure, Walker embodied the equally complex title character in a celebrated, modern-day small-screen adaptation of Othello. Although he occasionally popped up on the big screen, TV remained his primary medium, and in 2006 he landed the plum role of a high-powered attorney on Justice.
His father was from Grenada; his mother was from Trinidad; he was raised in North London.
Was inspired to pursue a career in the arts at age 9 after seeing Sidney Poitier in 1967's In the Heat of the Night.
Studied social work at the University of North London, but switched concentration to dance, and later joined London's Explosive Dance Theatre Company; a leg operation forced him to give up dancing for acting.
Made professional acting debut in 1983's Labelled With Love, a musical based on the songs of British pop band Squeeze.