Smokestack Lightnin' & more. Eamonn Walker, born 1959 in London, England came to the attention of American TV viewers playing Kareem Said, the moral and all-too-human heart of a state prison in the critically-acclaimed HBO series Oz. Walker has had a varied American acting career ranging from guest-starring roles on ER to heading up the short-lived Justice TV series. In Cadillac Records, Walker steals the show from the likes of Academy-Award-winning actor Adrien Brody and Grammy-award-winning singer Beyonce in his searing and downright frightening turn as blues legend Howlin’ Wolf. Walker tackles…and owns… the Wolf classic "Smokestack Lightnin’" .