Queen Elizabeth II dies at 96 , Prince Charles becomes king.

The longest-ever reign of Queen Elizabeth II, the only monarch most of her subjects have ever known, is over

Elizabeth Alexandra Mary Windsor, her estate in Scotland, died Thursday. She was 96. 

" The queen is dead, long live king!" As broadcasters proclaim the death of one sovereign and the ascension, 

Twitter and bells will ring and gun salutes will be fired throughout the United Kingdom. 

Her eldest son and heir, Prince Charles, Prince of Wales, 73, immediately became king upon her death. 

Elizabeth was in good health throughout her entire life. However, she suffered from lingering mobility issues that have impacted her over the past few months. 

Charles was increasingly her successor, taking over all of her duties, from the constitutional to the recreational.