1 Chronicles 10:1-14

And in chapter ten, we have the story, once more, of Saul's death. How in fighting against the Philistines up near mount Gilboa that Saul fell before the Philistines. He was hit with one of the arrows. An archer shot him. He realized that he wasn't going to come out of it, but he was still alive. He... Saul you remember was a big guy. Hard to kill him. And he knew that ultimately the wound from this arrow would get him, and so he pleaded with his armor bearer to thrust him through, to finish him off. But his armor bearer was fearful to do it. And so Saul fell upon his own spear. He set it out in front of him and fell upon it and died. And of course, when his armor bearer saw that Saul was dead, he also fell upon his spear.
Jonathan and his other brothers, the sons of Saul, were slain by the Philistines clear up in the area of mount Gilboa. The next day, as the Philistines were coming around stripping the bodies, they found the body of Saul, and they cut off his head and set it through the land of the Philistines in order that they might rejoice over the fact that they had killed Saul, the king of Israel. And they put his body in the temple of Dagon there in Bethshemesh, which is at the northern end of the mount Gilboa range where Gilboa comes down to a little stream. And the men across the valley, across the Jordan River about ten miles away I guess, over in Jabeshgilead, when they heard that Saul's body was pinned up there in the temple of the god with Jonathan, they came and they took the bodies and they took them back over on the other side of Jordan, and there they cremated them.
So in verse thirteen we are told,

Saul died for his transgression which he committed against the LORD, even against the word of the LORD, which he kept not, and also for asking counsel of one that had a familiar spirit, to inquire of it; and inquired not of the LORD: therefore the Lord slew him, and he turned the kingdom unto David the son of Jesse (1 Chronicles 10:13-14).

So Saul died for his transgression. And a fellow who had tremendous potential. I think that when God chose Saul there was demonstrated in Saul fabulous potential as a king. He was humble. He came from a good family. He seemed to be a natural leader. He was courageous. But before long, after a few victories, the women started coming out when Saul would walk down the street, and they would come out and they'd begin to dance with their tambourines. And they would sing, "Saul has killed his thousands." And Saul began to accept this praise and adulation of the people. He began to expect it. And pride began to get hold of the guy's life. And this is the thing that destroyed him. That humility was gone. And now his arrogancy and pride, which led to the tremendous jealousy of David, trying to drive David out. And then his disobedience to the commandments of God. And finally, when God would not answer him, he went to the witch at Endor to inquire of her, and therefore God allowed him to be killed there on the mount Gilboa. "