American actor James Earl Jones, an imposing stage and screen presence who overcame a childhood stutter to develop a stentorian voice recognised the world over as intergalactic villain Darth Vader, died on Monday at the age of 93, his agent said.Jones, a longtime sufferer of diabetes, died at his home surrounded by family members, agent Barry McPherson said. No cause of death was provided.Jones had a great physical presence on stage and television, as well as in movies, but he would have been a star even if his face was never seen because his voice had a career of its own. The…