BB King passed away on May 14, 2015. He had been suffering from diabetes and other health problems. His death was a great loss to the music world. He was a true blues legend, and his influence on music will always be remembered.
King Arthur died in a battle. He fought against his son or nephew, Mordred. In the fight, both sides suffered heavy losses. Arthur was mortally wounded. According to some versions, he was taken to the Isle of Avalon to be healed, but his final fate remains somewhat of a mystery.
The death of King Alexander was a significant event in history. He was in Babylon at the time of his death. After a night of heavy drinking, he fell ill. His condition deteriorated rapidly. His doctors were unable to save him. His death led to the fragmentation of his vast empire as his generals fought over different parts of it. This had a profound impact on the political and cultural landscape of the regions he had conquered. His sudden death at a relatively young age (he was in his early 30s) left many of his plans unfulfilled and changed the course of history.
Well, King Dasaratha's death was a tragic event. He was deceived by Kaikeyi who demanded that Rama be sent to the forest and her son Bharata be crowned instead. Dasaratha had promised her two boons in the past which he had to fulfill. When Rama left, Dasaratha was so distraught. He couldn't eat or sleep properly. His health deteriorated rapidly, and eventually, he succumbed to his sorrow and died.
I don't think so. There haven't been any official announcements or indications that the HxH manga will continue. But you never know, maybe there'll be a surprise in the future.