Lisa Marie Presley, the singer-songwriter and only child of Elvis Presley, died in January as a result of “small bowel obstruction” caused by scar tissue that developed after bariatric surgery years ago, the state medical examiner’s office said Thursday. Los Angeles County. .

Presley had been complaining Jan. 12 of severe abdominal pain, according to an autopsy report released Thursday by the medical examiner’s office. Later that day, her ex-husband, who was not named in the report, found her unconscious at her home in Calabasas, California.

Ms. Presley, 54, was taken by paramedics to a hospital, where she went into cardiac arrest and died that afternoon.

The report stated that although Ms. Presley had a history of drug use, she was sober “for the past few years.” Still, her health problems appeared to have occurred after her bariatric surgery, which is generally considered a treatment option for people with a high body mass index who have failed to lose weight through diet and exercise alone.

Juan M. Carrillo, Los Angeles County Assistant Medical Examiner, described Ms. Presley’s health problems after bariatric surgery as a “known long-term complication of this type of surgery.”

Ms. Presley was prescribed opioids after her surgery and after an infection, according to the report. She then was prescribed another type of medication so that she could be taken off the opioids.

The report noted that Ms. Presley had a “history of overmedication; she knew that she forgot that she had taken her medications and would take them again”.

The autopsy report said toxicology results showed “therapeutic levels of oxycodone” in his blood. Buprenorphine, a medication to treat opioid addiction, was also present but did not contribute to his death, according to the report.

For months, he complained of abdominal pain, fever, vomiting and nausea, but did not seek medical attention, according to the report.

The Los Angeles County coroner’s office had initially deferred a decision on Ms. Presley’s case. For months, officials said a medical exam had been done, but a pathologist was awaiting more test results, including potentially a toxicology report, before releasing an official cause of death.

Two days before Ms. Presley’s death, she attended the Golden Globe Awards, where “Elvis,” a biopic about her father’s life, was nominated for multiple awards. Some of her interviews on camera on the red carpet motivated concern from fans and others who said it had seemed unstable.

Ms. Presley was buried at Graceland, where a memorial was held in late January.

Weeks later, Priscilla Presley, the mother of Lisa Marie, who had long helped manage Elvis’s estate, went to court to challenge the validity of documents that said Lisa Marie’s daughter, actress Riley Keough , had become the sole administrator after the death of Lisa Marie.

In June, Ms Keough agreed to provide Priscilla Presley, her grandmother and Elvis Presley’s ex-wife, with a one-time payment as part of a settlement that would resolve the dispute over control of the family trust, according to court documents.

Lawyers for the parties had tried to keep details of their agreement confidential, but the documents list what appears to be a $1 million payment.

The New York Times reported that although the Elvis brand continues to rake in more than $100 million a year as a licensing giant, the family trust receives only a fraction of its profits.

On Wednesday, Ms. Keough was nominated for an Emmy for Outstanding Actress in a Limited Series or Television Movie for her lead role as the wild child in “Daisy Jones & the Six,” an Amazon miniseries about the rise and fall of fall of a fictional band from the 70s.