•"It is with a heavy heart that I must share the devastating news that my beautiful daughter Lisa Marie has left us," Priscilla Presley said.
•Lisa Marie, also a singer, was rushed to hospital earlier on Thursday. Media reports say she had cardiac arrest.
Lisa Marie Presley, the only child of rock'n'roll legend Elvis, has died aged 54, her mother has said.
"It is with a heavy heart that I must share the devastating news that my beautiful daughter Lisa Marie has left us," Priscilla Presley said.
Lisa Marie, also a singer, was rushed to hospital earlier on Thursday. Media reports say she had cardiac arrest.
She was found unresponsive at her home in Calabasas, California, sources told US outlet TMZ.
"She was the most passionate, strong and loving woman I have ever known," Priscilla Presley said in a statement.
"We ask for privacy as we try to deal with this profound loss,"
Her mother gave no details about the possible cause of death.
Sources close to Lisa Marie Presley told TMZ that she had suffered a "full arrest" before a bystander administered epinephrine - commonly known as adrenaline - to help her regain a pulse.
Born in 1968, Lisa Marie went on to follow in her father's footsteps and forged a career in music. The star released three albums, with her 2003 debut studio album selling hundreds of thousands of copies and receiving generally positive reviews.
The star was also well known for a series of high-profile marriages to pop legend Michael Jackson, actor Nicholas Cage and musicians Danny Keough and Michael Lockwood.
She had three children, including the actress Roxy Keough. Presley's son, Benjamin Keough, killed himself in 2020.
Presley was last seen in public on Tuesday night at the Golden Globes Awards in Beverley Hills.
Accompanied by her mother, the pair were seen breaking down in tears as they watched Austin Butler win the Best Actor prize for his portrayal of her father.
During an emotional speech, the actor thanked the Presley family for their help during the film.
"Thank you guys, thank you for opening your hearts, your memories, your home to me," Butler said. "Lisa Marie, Priscilla, I love you forever."