Prince William and Princess Kate have paid tribute to the Duchess of Kent following her death yesterday evening. The royal couple said their thoughts are with her immediate family, her husband and their three children, and praised Katharine's charitable work.
They said: "Our thoughts today are with The Duke of Kent and his family, particularly George, Helen and Nicholas. The Duchess worked tirelessly to help others and supported many causes, including through her love of music. She will be a much missed member of the family. W & C."
The personal message was shared on Kate and William's official social media pages.
The royal residence also lowered the union flag to half-mast as a mark of respect.
An online Book of Condolence will be available in the coming days.
The King, at Balmoral, has been informed and has approved Royal Mourning until the day of the funeral. The cause of death has not been revealed.
Details of her funeral will be announced in the coming days, although it is likely to be a Catholic service since the Duchess had converted to the religion.
It is likely to be well attended by members of the Royal Family, with the King and Queen, and both senior and non-working royals expected to pay their final respects.