Then Saul said to his armor-bearer, “Draw your sword and thrust me through with it, lest these uncircumcised come and thrust me through and abuse me!” But his armor-bearer would not do it, for he was terrified. Therefore Saul took his sword and fell on it.
“Therefore Saul took his sword and fell on it.” This is how Saul died: he took his own life. The story told by the Amalekite was a lie (see commentary on 2 Sam. 1:6).