Ahaziah was 22 years old when he became king, and he ruled from Jerusalem for only one year. His mother was Athaliah, a granddaughter of King Omri of Israel.
As soon as Athaliah heard that her son King Ahaziah was dead, she decided to kill any relative who could possibly become king. She would have done that,
Then I bowed my head and gave thanks to the God my master Abraham worships. The Lord had led me straight to my master's relatives, and I had found a wife for his son.