Lisa Marie Presley has died at the age of 54.
They were able to regain a pulse before transporting the 54-year-old to hospital, TMZ reported at the time. She was subsequently understood to be receiving treatment.
It has now been announced that she has died, with mum Priscilla Presley, 77, releasing an emotional statement.
Priscilla said: "It is with a heavy heart that I must share the devastating news that my beautiful daughter Lisa Marie has left us.
"She was the most passionate strong and loving woman I have ever known. We ask for privacy as we try to deal with this profound loss. Thank you for the love and prayers. At this time there will be no further comment."
Tributes to the only child of Elvis and Priscilla have begun pouring in as John Travolta posted a photo of her on his Instagram page and wrote: "Lisa baby girl, I’m so sorry. I’ll miss you but I know I’ll see you again. My love and heart goes out to Riley, Priscilla, Harper and Finley."
In a Twitter post, Oscar-winning actress Marlee Matlin wrote: "I had the chance to know Cilla Presley when I was on Dancing With the Stars and as a mother, I can't imagine the pain she must be going through with the untimely passing of Lisa Marie."
While Diane Warren shared her sorrow over the "horrible news". The singer added that "the entire world is sending love and prayers to Priscilla and Lisa Marie's children right now".
Beach Boys co-founder Brian Wilson said: "It's hard to take when someone so young and full of life passes on."
Tom Hanks, who appears in the biopic movie about Elvis, and his wife Rita Wilson shared a joint tribute to Lisa and recalled the time they'd spent together recently to promote the biopic.
Tom first posted a photo of Lisa Marie on his Instagram and wrote: "We are heartbroken over the loss of Lisa Marie Presley. Absolutely broken… Tom Hanks and Rita Wilson".
Rita later posted photos of herself, Tom and Lisa together and wrote: "Our hearts are broken with the sudden and shocking passing of Lisa Marie Presley tonight.
"Tom and I had spent some time with the family during the Elvis movie promotional tour. Lisa Marie was so honest and direct, vulnerable, in a state of anticipation about the movie.
"She spoke so eloquently about her father, what the movie meant to her, that it was a celebration of her dad. She had her gorgeous daughters Finley and Harper with her who made us all laugh.
"She privately showed us her home, Graceland, and she made it feel like home to us. She was so gracious to us, Austin, Baz, and guests. If you haven’t heard her music please go listen.
"She had a sultry voice, a power and tenderness, that I have always loved. Our hearts and our prayers go out to Riley, Harper, Finley , Danny @nava_rone and Priscilla. A mother should never have to lose a child. Lisa Marie lost her precious son Benjamin, Priscilla loses her only daughter. It’s too much. Sending love to the family, prayers for peace and strength. Love, Rita and Tom".
Days before her death, Lisa Marie Presley appeared unsteady as she spoke ahead of the Golden Globes awards.
During an interview with Extra, she turned to her pal Jerry Schilling, 80, and said "I'm gonna grab your arm" while she answered questions.
In the interview, Lisa chattered to Extra reporter Billy Brush and spoke of Austin Butler's performance as her late father Elvis in Baz Luhrmann’s biopic of the same name.
Lisa spoke slowly in the interview as she said she needed "five days to process" Butler's performance as her father because it was "so authentic".
Lisa Marie was the only child of the late singer Elvis and Priscilla. She was born nine months after the pair tied the knot and was just nine-years-old at the time of her father's death in 1977.
She leaves behind her three daughters; actor Riley Keough, 33, and twins Harper Lockwood and Finley Lockwood, 14.
Her son Benjamin Keough died in 2020. He took his own life, at the age of 27, at a property said to have belonged to his mother.
Lisa Marie wrote an essay for National Grief Awareness Day last year, in which she stated that, following his death, she kept going for the sake of her three daughters.
Lisa Marie's final Instagram post saw her share a screenshot of the essay as she wrote in the caption: "Hi. In honor of it being National Grief Awareness Day , I wrote an essay about Grief which was posted today on @people.
"I thought I’d post it here in the hopes that anyone who needs to hear all of this it helps in some way."
She wrote in the People essay: "I keep going for my girls. I keep going because my son made it very clear in his final moments that taking care of his little sisters and looking out for them were on the forefront of his concerns and his mind."
Just days before her own death, Lisa Marie had attended the Golden Globe Awards in Beverly Hills. She had been in attendance at the ceremony alongside her mother.
Lisa Marie, just like her mother, was seen cheering when actor Austin Butler, 31, won Best Actor in a Drama for portraying her father in the acclaimed biopic Elvis.
She had been full of praise for the actor's role as her father, saying he was able to "channel" her late dad in the biopic.
Austin paid tribute to the Presley family in his acceptance speech, saying: "The Presley family, thank you guys for opening your hearts, your memories, your home to me. Lisa Marie and Priscilla, I love you forever."
Lisa Marie had continued to keep her father's legacy alive in the decades since his death. This has included talking about him in various interviews over the years.
Describing him once, she said: "He was very protective [and] very adoring." Lisa Marie further commented: "I knew that I was loved, there's no question about that."
Fans and famous faces immediately took to social media to pay their respects following the sad news of her death.
Among those penning tributes on Twitter was singer Leann Rimes who wrote: "lisa marie presley… how heartbreaking. i hope she is at peace in her dad’s arms. my heart goes out to her family. too much grief in just a couple of years. #riplisamarie #LisaMariePresley"
Australian filmmaker Baz Luhrmann said he will miss Lisa Marie Presley’s “warmth, smile and love” following her death age 54.
Luhrmann, who directed the biopic about her father Elvis Presley, said on Instagram: “Over the last year, the entire Elvis movie family and I have felt the privilege of Lisa Marie’s kind embrace.
“Her sudden, shocking loss has devastated people all around the world.
“I know her fans everywhere join me in sharing prayers of love and support with her mother, Priscilla, and her wonderful daughters Riley, Finley and Harper.
“Lisa Marie, we will miss your warmth, your smile, your love.”