A few years ago I saw a video clip on the Internet from the movie Clerks. Danté and Randall argue over whether Lando and Wedge murdered all the Death Star contractors in Star Wars: Episode VI—Return of the Jedi. The argument ends when a third person, who was a contractor, says any DS2 contractors knew the risks working in a potential war zone.
A few months ago, I saw the end of Episode 4, where Luke destroyed the first Death Star. I suddenly realized that the facility may have had other prisoners besides Leia. The guards weren't totally shocked that Chewbacca is a new prisoner, after all.
So, Luke murdered other Death Star prisoners (whether in the same cell as Leia or in other ones), right? Unless there's some proof that Leia was the only one. (But again, the guards weren't surprised about a new prisoner.)