Queen Elizabeth is said to be "deeply upset" following the sudden death of her housekeeper.
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Annette Wilkin, who had worked for the royal family for 45 years, died suddenly after a short illness aged 72, reported Daily Mail.
Annette was said to be so loved by the monarch that she was given one of her famous royal corgis.
The beloved royal aid had worked for the royals in various roles since 1974, starting out as a maid before working her way up to head housekeeper at Windsor Castle.
She also managed Frogmore House, which was the wedding reception venue for the Duke and Duchess of Sussex after their 2018 nuptials.
Dickie Arbiter, who previously worked as the Queen's press spokesperson, shared his fond memories of Annette on his Twitter account after learning of her death.
"I knew Annette well – such a lovely lady and always so very helpful every time I stayed at #WindsorCastle. RIP Annette," he tweeted.
It is understood that the Queen is likely to break royal protocol to attend Annette's funeral, a rare honour as she does not go to funerals as a rule.