According to a portion of the Queen's death certificate that has been made public, she passed away from old age.
Princess Anne, who is listed on the certificate as the "informant," would have informed the regional registrar of her mother's passing.
The document, which was made public by National Records of Scotland, also mentions that on Thursday, September 8, at 3:10 p.m., Britain's longest-reigning monarch passed away.
Princess Anne acknowledged her mother's passing and said she was by the head of state's side during her final moments.
I was lucky to share my dearest mother's final 24 hours of life, said Anne, who traveled with her mother's casket on the journey from Balmoral to London via Edinburgh.
Below explains the death certificate further;
Elizabeth Alexandra Mary Windsor is stated as the Queen's complete name, and Her Majesty The Queen is listed as her title.
Windsor Castle is listed as her primary residence.
Her cause of death lists Douglas James Allan Glass as the attending physician.
Her parents' names are also listed: Elizabeth Angela Marguerite Bowes-Lyon (ms.) or Windsor, also known as Queen Elizabeth The Queen Mother, and Albert Frederick Arthur George Windsor, popularly known as King George VI.
Here is a look at the Death Certificate of the Late Queen elaborated above;
