Police have launched a desperate manhunt for a killer after he breached the terms of his licence sentence. Shaun Walker is currently on the run from police after being recalled to prison yesterday. Walker was sentenced to eight years in prison and four on licence after being found guilty of manslaughter in December 2013. The former scrap metal dealer, who was 19 at the time, killed Barry Thomas, 45, by punching him “a number of times” in June 2013 in a row over a moped. In a statement, Gwent police said: “Can you help us find this Newport man? “Shaun Walker, 29, has been recalled to prison. “I…