1. Lady Sybil's Death on Downton Abbey
I knew this development was coming because I'd been spoiled after the U.K. airing, and yet and yet and yet...I wept like an infant. Downton Abbey has gotten so fast in its plotting that it's hard to get attached to any of its careening developments. But Sybil was a wonderful character, and Jessica Brown Findlay was lovely on the show. So yes: weep!
I also loved Sybil and Thomas' relationship, so this part made me cry too.
2. "The Ghost Is Seen" episode of Enlightened
3. The "Six Minutes" episode of The Killing
Also, this YouTube user put Ray's journey to Mozart's "Requiem: Lacrimosa."
4. Catelyn's death at the Red Wedding on Game of Thrones. (Also, the entire Red Wedding.)
I don't think there's anything more to say here?