Your answer, "Saul", is not correct.
The correct answer to
Who killed Saul (in the time of David)?
is
A young Amalekite
as shown by
2 Samuel 1:5-10
which is
- KJV
- [5] And David said unto the young man that told him, How knowest thou that Saul and Jonathan his son be dead? [6] And the young man that told him said, As I happened by chance upon mount Gilboa, behold, Saul leaned upon his spear; and, lo, the chariots and horsemen followed hard after him. [7] And when he looked behind him, he saw me, and called unto me. And I answered, Here am I. [8] And he said unto me, Who art thou? And I answered him, I am an Amalekite. [9] He said unto me again, Stand, I pray thee, upon me, and slay me: for anguish is come upon me, because my life is yet whole in me. [10] So I stood upon him, and slew him, because I was sure that he could not live after that he was fallen: and I took the crown that was upon his head, and the bracelet that was on his arm, and have brought them hither unto my lord.
- NIV
- [5] Then David said to the young man who brought him the report, "How do you know that Saul and his son Jonathan are dead?" [6] "I happened to be on Mount Gilboa," the young man said, "and there was Saul, leaning on his spear, with the chariots and riders almost upon him. [7] When he turned around and saw me, he called out to me, and I said, `What can I do?' [8] "He asked me, `Who are you?' "`An Amalekite,' I answered. [9] "Then he said to me, `Stand over me and kill me! I am in the throes of death, but I'm still alive.' [10] "So I stood over him and killed him, because I knew that after he had fallen he could not survive. And I took the crown that was on his head and the band on his arm and have brought them here to my lord."