Walter White Murders Mike Ehrmantraut
The character of Mike (played by Jonathan Banks) feels as if he's had enough of "the game." Feeling drawn out by the DEA, and left battered from the war with Walt, Mike gets taken out by Mr. White. Truly, no one saw it coming (not even Mike), and the scene was beautifully scribed by Thomas Schnauz who knocked the episode right out of the ballpark.
See for yourself below: