Dead at Last
It was a well-known fact that Shepard had killed people, be it mercenaries, Collectors, geth and reapers. Part of her didn't like it, but she had to because they left her no choice. But after the fight with Kai Leng in Cerberus Headquarters, and she stabbed her omni-blade through his chest, she had a sudden feeling that she couldn't quite describe.
It was the first person she had killed that she…enjoyed killing. Hell, who wouldn't. The man had followed her everywhere. He had murdered her friend Thane. The feeling of vengeance surged through her veins like adrenaline. It was exhilarating.
Shepard was glad the bastard was dead and gone. With the truth about the Catalyst, she could finally return to Earth. A battle that would decide the fate of every being.