LOS ANGELES The son of Lisa Marie Presley has died. Presleys representative Roger Widynowski said in a statement Sunday to The Associated Press that she was heartbroken after learning about the death of her son Benjamin Keough. He is the grandson of the late Elvis Presley. TMZ reports that Keough died from a self-inflicted gunshot wound Sunday in Calabasas, California. He was the love of her life.Presley had Keough and a now 31-year-old daughter with her former husband Danny Keough.