My suspicion throughout Series 4 was that Hank knew about Walter's secret life

[Monty91]

but I think that theory is dead in the water now.

Shame to lose Mike, as seems likely. Great character...

[Classic Jorge]

You do mean this show, right?

http://images1.wikia.nocookie.net/__cb20110915014216/kingofthehill/images/c/ca/King_of_the_hill_characters-5146.jpg