Remember though, these are rehashings of tales you'll find elsewhere in the Bible. If you're up on your 1 and 2 Samuel and 1 and 2 Kings, then this should be smooth sailing. If not, Shmoop is on the job.
A little background info before we start: Saul was appointed King of Israel by Samuel (Yahweh's favorite prophet at the time). Saul starts out okay, but then slowly starts disobeying God.
Eventually, God starts to kind of regret putting Saul in charge so he tells Samuel to go out and find a new king.
David hangs around, befriends Saul's son, marries his daughter, and wins all kinds of battles. Meanwhile, Saul falls deeper and deeper into a terrible-king hole until he's finally overpowered in battle.
And here's where the Chronicler starts—with Saul's death.
This is pretty much the same story you'll read in 1 Samuel 31. Saul's sons have been killed in battle with the Philistines and they're closing in on Saul.
Instead of being torn limb from limb by the Philistines, Saul asks his armor-bearer to kill him with his sword. The armor-bearer is less than thrilled so Saul falls on his own sword and dies.
When the Philistines find Saul's body they strip him naked, cut off his head, and start spreading the good news that the King of Israel is dead. It's a good day to be a Philistine.
Of course this is seriously bad for Israel, but the Chronicler knows that Saul deserved it. He didn't listen to God and he even talked with a fortune teller. God despises fortune-tellers.