In one section of her new memoir, Priscilla Presley recounts the harrowing details of her daughter Lisa Marie Presley 's death.

She writes about being in the hospital room after Lisa Marie suffered a small bowel obstruction that led to cardiac arrest. Her daughter was on a ventilator, and finally, Priscilla had to make the gut-wrenching decision to withdraw life support.

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This week, an excerpt from the book — called Softly, As I Leave You: Life After Elvis — published in People sheds light on those difficult moments.

"I knew from the first moment I walked into Lisa's hospital room that she was already gone," Priscilla recounts.

She says that Lisa Marie was only breathing because of the machine, and though she had a heartbeat,

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