..and shalt be turned into another man" (1 Samuel 10:6). Nonetheless, Saul's nature did not change. He became jealous of David who had been his ally and support, because of David's good deeds such as killing Goliath. His jealousy kept growing and he became distant from God:."..God is departed from me, and answereth me no more, neither by prophets, nor by dreams..." (1 Samuel 28:15). Instead, he even tried to kill David and threw a spear at his own son, Jonathan whom David had befriended. Saul's demise is dictated by his deeds; he does not obey God and falls...

His sins determine his tragic destiny as he dies during a battle against the Philistines which destroy the Israelite army, who had no chariots and heavy weaponry. He dies tragically on Mount Gilboa with his three sons. Upon his death, David was crowned king.
Konig, George. "Saul King." 1996. List of Bible People. http://www.aboutbibleprophecy.com/p65.htm

Wilkerson, David. Fulfilling your destiny! 1996. http://www.tscpulpitseries.org/english/1990s/ts960708.html