Lisa Marie Presley, the daughter of actress Priscilla Presley and Rock legend Elvis Presley, died Thursday after she was found unresponsive at her California home.

The 54-year-old had suffered a “full arrest” before someone administered epinephrine – commonly known as adrenaline – to help her regain a pulse, a source told TMZ. Her ex-husband Danny Keough – who lived with her in the same house – had performed CPR on her before paramedics arrived, TMZ reported.

Lisa Marie has had a long history of drug and alcohol abuse. According to Daily Mail, she abused drugs from the age of 13-17. Her mother had later checked her into a Scientology rehab center.

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Following her son Benjamin’s death by suicide in July 2020 aged 22, her ex-husband Michael Lockwood raised concerns that she might have a relapse.

Lockwood and Lisa Marie split in 2016 after 10 years of marriage. In 2020, Lockwood filed papers in court to strip her of primary custody, claiming “new and significant concern” over her potentially relapsing.

“Lisa Marie Presley’s son shot and killed himself in her home (Although she was not there at the time.) With all due sympathy and respect, this creates a new and unaddressed twofold problem: the safety of the children and the greater likelihood of [Presley] to relapse into drug and alcohol dependency,” the filing stated, according to People magazine.

In 2019, she had opened up about her past addiction to painkillers and opioids in the foreword for Harry Nelson’s book The United States of Opioids: A Prescription for Liberating a Nation in Pain.

“You may read this and wonder how, after losing people close to me, I also fell prey to opioids,” wrote Presley, who saw both her father Elvis Presley and ex-husband Michael Jackson die of drug use complications.

“I was recovering after the [2008] birth of my daughters, [Harper] Vivienne and Finley, when a doctor prescribed me opioids for pain,” she added. “It only took a short-term prescription of opioids in the hospital for me to feel the need to keep taking them” due to their addictive properties.

By 2013, Lisa Marie had checked into rehab at least five times.

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In the book, she mentioned her children as the reason to stay sober. “As I write this, I think of my four children, who gave me the purpose to heal,” after considering “the countless parents who have lost children to opioids and other drugs.”

“[I’m] grateful to be alive today… and to have four beautiful children who have given me a sense of purpose that has carried me through dark times,” she added.