2 Samuel 17:23
"And when Ahithophel saw that his counsel was not followed, he saddled his ass, and arose, and gat him home to his house, to his city, and put his household in order, and hanged himself, and died, and was buried in the sepulchre of his father."
Cross References (ranked by relevance)
And he cast down the pieces of silver in the temple, and departed, and went and hanged himself.
In those days was Hezekiah sick unto death. And the prophet Isaiah the son of Amoz came to him, and said unto him, Thus saith the LORD, Set thine house in order; for thou shalt die, and not live.
And Absalom sent for Ahithophel the Gilonite, David’s counsellor, from his city, even from Giloh, while he offered sacrifices. And the conspiracy was strong; for the people increased continually with Absalom.
Destroy thou them, O God; let them fall by their own counsels; cast them out in the multitude of their transgressions; for they have rebelled against thee.
And it came to pass, when Zimri saw that the city was taken, that he went into the palace of the king’s house, and burnt the king’s house over him with fire, and died,
And one told David, saying, Ahithophel is among the conspirators with Absalom. And David said, O LORD, I pray thee, turn the counsel of Ahithophel into foolishness.
But thou, O God, shalt bring them down into the pit of destruction: bloody and deceitful men shall not live out half their days; but I will trust in thee.
Pride goeth before destruction, and an haughty spirit before a fall.
The foolishness of man perverteth his way: and his heart fretteth against the LORD.
Is not destruction to the wicked? and a strange punishment to the workers of iniquity?