Queen Elizabeth's cause of death has been revealed. The late monarch's death certificate was just released and reports that she passed away from old age. According to an expert from an entry in the Register of Deaths, Her Majesty died on September 8, 2022 at 3:10 PM at Balmoral Castle in Scotland at the age of 96. Her daughter, Princess Anne, was the informant. With the time of death released, The Daily Mail reports that only King Charles and his sister were by their mother's side when she died.