2 Samuel 1:9-10

9And he said to me, aStand beside me and kill me, for anguish has seized me, and yet my life still lingers.’ 10So I stood beside him and killed him, because I was sure that he could not live after he had fallen. bAnd I took the crown that was on his head and the armlet that was on his arm, and I have brought them here to my lord.”

2 Samuel 17:23

23When Ahithophel saw that his counsel was not followed, he saddled his donkey and went off home to chis own city. He dset his house in order and ehanged himself, and he died and was buried in the tomb of his father.

1 Kings 16:27

27Now the rest of the acts of Omri that he did, and the might that he showed, are they not written in the Book of the Chronicles of the Kings of Israel?
Copyright information for ESV