LOS ANGELES The son of Lisa Marie Presley has died. He is the grandson of the late Elvis Presley. TMZ reports that Keough died from a self-inflicted gunshot wound Sunday in Calabasas, California. She is completely heartbroken, inconsolable and beyond devastated but trying to stay strong for her 11-year-old twins and her oldest daughter Riley, Widynowski said in the statement. He was the love of her life.Presley had Keough and actress Riley Keough, 31, with her former husband Danny Keough.