Then Saul said to his armor bearer, "Draw your sword and thrust me through with it, lest these uncircumcised come and abuse me." But his armor bearer would not, for he was greatly afraid. Therfore Saul took his sword and fell on it.
I Chronicles 10:13 ::
So Saul died for his trespass which he committed against the LORD, because of the word of the LORD which he did not keep; and also because he asked counsel of a medium, making inquiry of it, and did not inquire of the LORD. Therefore He killed him, and turned the kingdom to David the son of Jesse.