[Warning: Spoilers for all four seasons of "The Killing" follow.] If there's any series that could best be described as "Sisyphean," it's "The Killing." No show gave its fans so much hope at the beginning of each season that this one would end differently than the last... only to fall apart at the end and make you wonder why you spent all those hours watching Seattle detectives Sarah Linden (Mireille Enos) and Stephen Holder (Joel Kinnaman) chase down bad lead after bad lead and smoke cigarette after cigarette.