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Lord Robert Fellowes, pictured above in 2013, died Monday.Getty Images
Prince William and Prince Harry’s uncle Lord Robert Fellowes died Monday. He was 82.

The cause of death is “undisclosed,” according to his obituary published in the London Times Wednesday.

Fellowes became Princess Diana’s brother-in-law in April 1978 when he married her sister Lady Jane Fellowes (née Spencer).

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Fellowes was 82.Getty Images

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Prince Harry and Prince William, seen here in 2022, have yet to publicly react to their uncle’s death.POOL/AFP via Getty Images

The late Princess of Wales was one of Jane’s bridesmaids.

The couple went on to welcome daughters Laura, 44, and Eleanor, 38, and son Alexander, 41, all of whom have yet to publicly address their dad’s death.

William, 42, and Harry, 39, also have not released statements on the loss.

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Fellowes married William and Harry’s mother Princess Diana’s sister Jane in 1978.PA Images via Getty Images

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He is survived by three children.Getty Images

However, a former friend of the Duke of Sussex, who quit his royal duties in 2020 and moved to the US, told the Daily Beast Wednesday, “The death will be a huge blow to the Spencer family. In normal times, it would be unimaginable that Harry would not be there to support Jane. … But these are not normal times, and it may well be that everyone feels Harry’s attendance [at the funeral] would just create too much drama. It will be very sad for him if he can’t make it.”

Robert worked in banking before and after he served as Queen Elizabeth II’s private secretary from 1990 to 1999.

Notably, he worked for the late monarch during Diana’s 1996 divorce from King Charles III after his affair with now-wife Queen Camilla.

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Robert was Queen Elizabeth II’s private secretary in the 1990s.Tim Graham Photo Library via Getty Images

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He advised the monarch during Diana’s divorce and death.Tim Graham Photo Library via Getty Images

Robert also advised Elizabeth the following year when Diana died in a car crash.

After the accident, Robert called the late princess “a good, good person” in a statement.

“I was deeply fond of her,” he said at the time. “She found it difficult in life to find happiness, and I’m sad for people who have that situation.”