The death and burial of Ahab brings a grim closure to the prophecies of doom spoken against him. On a basic level, his body is returned to his capital city to be buried in Samaria [ביאור שטיינזלץ]. However, this journey back to the capital is far more than a mere historical record; it is a vital step in the fulfillment of God's word. Returning the fallen king leads directly to the washing of his blood-soaked chariot in the pool of Samaria. There, dogs lick up his blood and prostitutes bathe in the stained waters, exactly as it was divinely decreed [אברבנאל].
This gruesome reality sheds light on the true nature of Ahab's earlier repentance. It becomes clear that his remorse was strictly limited to his involvement in the murder of Naboth the Jezreelite. Because of that specific act of repentance, God withheld His immediate anger, choosing to delay the total destruction of the royal house, the death of Ahab's sons, and the punishment of Jezebel until the days of his son [אברבנאל].
Consequently, Ahab's death in the current battle serves as a direct punishment for an entirely different sin: the release of the Aramean king, Ben-Hadad. Ahab's demise is the exact fulfillment of Micah's prophecy, which declared that his life would be taken in exchange for the life of Ben-Hadad. The second half of that tragic decree, which warned that the Israelites would suffer in place of the Aramean people, was realized years later during the destructive wars of Hazael [אברבנאל].