2 Samuel 17:14, 23

Absalom and all his company agreed that the counsel of Hushai the Arkite was better than the counsel of Ahithophel. (GOD had determined to discredit the counsel of Ahithophel so as to bring ruin on Absalom.)

When Ahithophel realized that his counsel was not followed, he saddled his donkey and left for his hometown. After making out his will and putting his house in order, he hanged himself and died. He was buried in the family tomb.