1 Kings 16:18
When Zimri observed that the city had been captured, he retreated into the king's palace, set fire to the citadel, and died when the palace burned down around him
2 Samuel 17:23
Meanwhile, when Ahithophel observed that his counsel was not being acted upon, he saddled his donkey, got up, and left for his hometown. Leaving behind a set of orders for his household, he hanged himself. After his death he was buried in his father's tomb.
1 Samuel 31:4-5
Saul told his armor bearer, "Draw your sword and run me through with it, or these uncircumcised people will come and run me through and make sport of me." But his armor bearer did not want to do it because he was very frightened, so Saul took the sword and fell on it.
Judges 9:54
So he cried out to his young armor bearer and ordered him, "Draw your sword and kill me, so no one will say about me that "A woman killed him.'" So the young man pierced him through, and he died.
Job 2:9-10
Then his wife told him, "Do you remain firm in your integrity? Curse God and die!"
Matthew 27:5
But they replied, "What do we care? Attend to that yourself." Then he flung the pieces of silver into the sanctuary, went outside, ran away, and hanged himself.