Queen Elizabeth II, the UK's longest-serving monarch, has died at the age of 96 after reigning for 70 years. She passed away peacefully at her Scottish estate, Balmoral, surrounded by her family. The Queen's death marks the end of an era, and her son King Charles III has succeeded her as the new monarch. The Royal Family has entered a period of mourning, and official engagements will be cancelled in the coming days.