There were so many times that I found him down on the floor or unable to control his body very well,” Lisa Marie Presley writes of her father, Elvis, in her posthumous new memoir.

Elvis, who died in 1977, didn't live to see his grandchildren. If he had lived, he would have had multiple reasons to smile: Lisa Marie had four children — three daughters (including twins) and a son. Lisa Marie had two children with Danny Keough, a musician who was the first of her four husbands.

Riley Keough has unveiled a heartbreaking letter written by her late mother, Lisa Marie Presley, in which she begged her father Elvis not to die. Elvis Presley, who died in 1977 aged just 42, suffered with health problems in his later life – his daughter Lisa Marie was only nine years old at the time of his death.