Contradiction with 1 Chronicles 10:13-14
These verses imply that Saul's death was a result of his unfaithfulness to God and seeking guidance from a witch, which provides additional reasons for his demise, not mentioned in 1 Chronicles 10:6.
1 Chronicles 10:13-14: So 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 enquire [of it]; [committed: Heb. transgressed]