2 Samuel 17:23

"When Ahithophel saw that his counsel was not followed, he saddled his ass and went off home to his own city. And he set his house in order, and hanged himself; and he died, and was buried in the tomb of his father."

Along with Judas Iscariot (Matthew 27:5), Zimri (1 Kings 16:18), and King Saul (1 Samuel 31:5). Ahithophel is one of only four suicides mentioned in the Bible. The fact that he was buried in the family tomb is supposed by some to indicate that the Jews of that period accepted suicide much as any other death was accepted. We do not know if that is true or not. Many have pointed out that Ahithophel was somewhat a type of Judas Iscariot.