The royal family has announced the shock death of Thomas Kingston, the husband of Lady Gabriella Windsor.
Kingston, 45, married Gabriella in 2019.
She is the daughter of Prince and Princess Michael of Kent.
Prince Michael, grandson of King George V, was a cousin to Queen Elizabeth II.
A statement on behalf of Lady Gabriella and her family said Kingston was an "exceptional man".
The news comes as the royal family gathers for a memorial service in Windsor for King Constantine of Greece, who died last year.
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William, the Prince of Wales, withdrew from the service at the last minute citing personal reasons, but it is unclear if his decision was at all linked to Kingston's death.
Prior to his marriage, Kingston had dated Pippa Middleton, the sister of Catherine, Princess of Wales.
The royal family has been rocked with bouts of bad news in early 2024, with Princess Catherine continuing to recover from abdominal surgery, while King Charles III has been diagnosed with an unspecified form of cancer.
