When his armor-bearer saw that Saul was dead, he too fell on his own sword and died with him.

Judges 9:54
He quickly called his armor-bearer, saying, "Draw your sword and kill me, lest they say of me, 'A woman killed him.'" So Abimelech's armor-bearer ran his sword through him, and he died.

1 Samuel 31:4
Then Saul said to his armor-bearer, "Draw your sword and run it through me, or these uncircumcised men will come and run me through and torture me!" But his armor-bearer was terrified and refused to do it. So Saul took his own sword and fell on it.

1 Samuel 31:6
So Saul, his three sons, his armor-bearer, and all his men died together that same day.

1 Kings 16:18
When Zimri saw that the city was captured, he entered the citadel of the royal palace and burned it down upon himself. So he died

And when his armor bearer saw that Saul was dead, he fell likewise on his sword, and died with him.