Who was the king of Israel when Elisha died?

Answer: Jehoash

Jehoash king of Israel went down to see Elisha when he was suffering from his final illness.

“When Elisha had fallen sick with the illness from which he would die, Jehoash king of Israel came down to him and wept over him, saying, “My father, my father, the chariots and horsemen of Israel!””— 2 Kings 13:14 (BSB)