The cause of Queen Elizabeth II's death on September 8 at the age of 96 was "old age," according to the official death certificate, published this Thursday by Scotland's civil registry.

The document released by the so-called National Records of Scotland, and signed by Elizabeth II's daughter, Princess Anne, states that the monarch's time of death was declared at 3:10 pm on September 8.

According to Lusa, the official announcement of death was at 6:30 pm, but until now the exact time of death was uncertain. A spokesman for the British Prime Minister said that Liz Truss was informed at 16:30. Earlier, at 12:30, Truss had left a debate in parliament after being informed of the monarch's worsening health, as did the leader of the Labour Party (the main opposition force), Keir Starmer.

The monarch died at Balmoral Castle in Scotland surrounded by close family members, but Buckingham Palace, the official residence of the British royal family in London, did not reveal at the time the cause of death.

Elizabeth II had received outgoing Prime Minister Boris Johnson and successor Liz Truss two days earlier and was being monitored for several days by doctors, who hours before the death was announced reported that her condition had worsened, without giving details.

Since the beginning of the year Elizabeth II had significantly reduced public engagements and the Palace had admitted that she was suffering from mobility problems.

A state-honored funeral service on September 19 at Westminster Abbey in London was the culmination of 10 days of religious ceremonies, street processions, and public wakes to honor the monarch, who reigned for 70 years. Elizabeth II was buried in St. George's Chapel at Windsor Castle.

On the 24th, Buckingham Palace unveiled the image of the Queen's headstone. The Belgian black marble slab bears the names of the Queen and her husband Prince Philip and her parents George VI and Elizabeth.