SAUL was the king of Israel because the people wanted a bone and flesh king, so God put Saul as king, well that doesn't relate the part that does is in his death.
he was in battle and people soooo wanted to kill him, by that time he wasn't a "king" for complete anymore cause David was already blessed from God to be the new king. Saul disobeyed God and obviosuly he felt deep quilt , he ended up loosing it all.
It relates even in the place: I hear jerusalem bells are ringning" and all those parts... I relate it as if Saul could already be expecting his own death. He killed himself before they would catch him first...and when they did, already dead they cut his head.
so...yup, this is why I relate it to SAUL :P