How Did King of the Hill End on Fox?

The end of Fox's King of the Hill happened twice - first on the network itself and then in syndication. Which episode was the intended series finale?

King of the Hill' May Get a Dang Ol' Revival – Texas Monthly

Fox Won't Host a 'King of the Hill' Revival – The Hollywood Reporter

King of the Hill Reboot Not Happening On Fox, I Tell You What - IGN The Fix: Entertainment - IGN

King of the Hill' might return to Fox

King of the Hill (season 13) - Wikipedia

Johnny Hardwick's Body Too Decomposed to Determine Cause of Death

King of the Hill (season 11) - Wikipedia

FOX Sunday Animation Domination (11.16.08)

King Of The Hill' endures, 25 years later : Pop Culture Happy Hour : NPR