When Elvis Presley's only child, Lisa Marie, died aged 54 last year she left behind an intimate request: for daughter Riley Keough to finish off her memoir based on recorded tapes and their time together.

On the day of the book's release, the BBC met with Keough in New York to discuss From Here to the Great Unknown, a life story filled with trauma, addiction, loss and grief.

"It made me emotional that she was sharing it with the world because it was a story that she felt very protective of,” Keough, a soft-spoken 35-year-old actress, said on Tuesday.

In the memoir, Lisa Marie Presley details the toll that her legendary dad's death - when she was just nine - took on her.

For the first time, she describes waking up on the afternoon that he died in August 1977 and sensing something was wrong, before running into her father's room across the hallway and seeing him facedown on the bathroom floor.