Damn, that ending just hit me like a ton of bricks. I'm actually bummed out by it. Carter was my favorite character. Though the clues were there about who would wind up dying (Joss reconciling with her son's father so he could take care of the kid, Reese's expressing his feelings for her, the "everyone's way too happy" sequence leading up to the shooting), I kept hoping it wouldn't happen.
I like Fusco, but I would have been able to deal with his death, especially when he would have gone out in a good way. But Carter is the heart and soul of the show, and the only character with any kind of really compelling personality. Everyone else are just damaged sociopaths or otherwise emotionally stunted in some way (except Fusco). Fusco is now about the closest we have to a normal person on the show, and while he's likeable, he's not the same as Carter.
I have faith that they can continue to deliver compelling drama and action on the show, but I have a bad feeling that Carter's death is really going to upset the emotional dynamic of the show. I hope I'm wrong.
Anyway, Taraji P. Henson will be missed. She did an fantastic job on the show and the fact that her character's death actually bummed me out is a testament to that. I wish her the best in her next acting gig, and hopefully we can still see her occasionally in a flashback scene on PoI.