His father is from Grenada and his mother is from Trinidad.
Attended the University of North London.
Walker had praised his acting mentor and best friend Rita Moreno for his humble beginnings as an actor.
He has three children, two of them are twins.
He was nominated for a 2016 Joseph Jefferson (Equity) Award for Actor in a Principal Role in a Play for "Between Riverside and Crazy" at the Steppenwolf Theatre Company in Chicago, Illinois.
Made his London stage debut in the play Labelled With Love.