After feeding the walkers and killing sister Mika, there was little doubt what needed to be done. Still, as Carol told Lizzie to "look at the flowers" and the shot rang out, it was a death we won't soon forget, even on a show filled with unimaginable horrors.
You walk outside, you risk your life. You take a drink of water, you risk your life. Nowadays you breath and you risk your life. You don’t have a choice. The only thing you can choose is what you’re risking it for.