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?

Why did 'King of the Hill' end? - Quora

King of the Hill Reboot 2017 - Fox Is in Talks to Bring Back King of the Hill

FOX Sunday Animation Domination (11.16.08)

King Of The Hill : The Complete First Season - DVD - Region 4

Johnny Hardwick, voice of Dale Gribble on 'King of the Hill,' dies at 64

Johnny Hardwick dead: 'King of the Hill' actor dies at 64 - Los Angeles Times

King of the Hill (TV Series 1997–2010) - IMDb

Season 13, King of the Hill Wiki

King of the Hill Fox premiere night promos

The Real Reason King Of The Hill Was Canceled

Review: King Of The Hill : Pop Culture Happy Hour : NPR