Lisa Marie Presley and grandson of Elvis Presley, died in Calabasas, California, on Sunday, ET confirms. He was 27.The Los Angeles County Medical Examiner tells ET that Benjamin's cause of death has been ruled a suicide by intraoral shotgun wound.«Lisa Marie is completely heartbroken, inconsolable and beyond devastated but trying to stay strong for her 11-year-old twins and her oldest daughter, Riley,» Presley's rep tells ET.