Royal reporter Robert Jobson disclosed details in his book, “Catherine, the Princess of Wales: A Biography of the Future Queen,” that Elizabeth II felt “terribly frail” owing to a battle with a type of bone marrow cancer known as myeloma.

In recent years, the Queen of Great Britain, Elizabeth II, suffered from bone cancer. This was the reason for her death in2.Former Prime Minister

Former U.K. Prime Minister Boris Johnson said the late Queen Elizabeth II had a form of bone cancer in her final years. Johnson’s new memoir, Unleashed, will hit booksellers’ shelves in October. But an excerpt teased this week offered a rare behind-the-scenes glimpse into the queen’s cause of death.

Queen Elizabeth II was battling bone cancer before her death, according to a new book. Former U.K. Prime Minister Boris Johnson detailed in his memoir, “Unleashed,” his final meeting with the late monarch,

"Her doctors were worried that at any time she could enter a sharp decline," the former prime minister writes about the late Queen in his memoir 'Unleashed'

In the months before Queen Elizabeth II died, Buckingham Palace said virtually nothing about her health challenges other than that she was suffering from “mobility issues.” Her death certificate said that she died only of “old age” aged 96.

Britons are eagerly awaiting the release of former Prime Minister Boris Johnson's autobiography. The politician has included an extensive section about Queen Elizabeth's illness, which he says she struggled with in the final years of her life.