Queen Elizabeth II, Britain's longest serving monarch, has died at 96. She reigned for 70 years.
The royal family - the Queen's son and heir Prince Charles, grandsons William and Harry and their families - have gathered at her Balmoral retreat in the Scottish highlands, where she spent her last days.
The UK celebrated the Queen's Platinum Jubilee to mark 70 years of service to the nation with grand events in June.
In 2015, Queen Elizabeth became the longest-serving British monarch, surpassing her great-great grandmother Queen Victoria. This year, she became the world's second longest reigning monarch.
Here are the highlights on Queen Elizabeth II's demise:
Japan Prime Minister Fumio Kishida said that Queen Elizabeth's death 'great loss' for the world.
Ukrainian President Volodymyr Zelenskiy extended condolences to Britain and the Commonwealth on Thursday following the death of Queen Elizabeth.
"It is with deep sadness that we learned of the death of Her Majesty Queen Elizabeth II. On behalf of the Ukrainian people, we extend sincere condolences to the entire United Kingdom and the Commonwealth over this irreparable loss," Zelenskiy wrote on Twitter.
Sporting events in Britain scheduled for Friday, including Test cricket and European golf's PGA Championship, have been cancelled as a mark of respect following the death of Queen Elizabeth II.
British horse racing chiefs also pressed the pause button as tributes poured in for the late British monarch from across the sporting world.
The England and Wales Cricket Board (ECB) said Friday's play between England and South Africa in the third Test at the Oval would not take place.
Russian President Vladimir Putin on Thursday offered his condolences to King Charles III following the death of Queen Elizabeth II, wishing the new monarch "courage and resilience" after his mother's passing.
"The most important events of the United Kingdom's recent history are inextricably bound with the name of Her Majesty. For many decades Elizabeth II rightfully enjoyed her subjects' love and respect as well as authority on the world stage," Putin said, according to a Kremlin statement.
Pope Francis said Thursday he was "deeply saddened" at the death of Queen Elizabeth II, offering prayers for her "eternal rest" and for her son Charles as he becomes king.
In a personal telegram to the new monarch, the head of the Catholic Church paid tribute to the queen's "life of unstinting service... her example of devotion to duty, her steadfast witness of faith in Jesus Christ", and, addressing the new Charles III, "I invoke an abundance of divine blessings as a pledge of comfort and strength in the Lord".Queen Elizabeth II dies at 96.
The plane that has landed in Aberdeen is carrying the Duke of Cambridge, the Duke of York and the Earl and Countess of Wessex, reports BBC.