1Then Saul said to his armor bearer, "Draw your sword and pierce me through with it, otherwise 2these uncircumcised will come and pierce me through and make sport of me." But his armor bearer would not, for he was greatly afraid. 3So Saul took his sword and fell on it.
References for 1 Samuel 31:4
When his armor bearer saw that Saul was dead, he also fell on his sword and died with him.
Thus Saul died with his three sons, his armor bearer, and all his men on that day together.