The Bible was not written in King James English.
In the Hebrew text, the literal meaning is 'Don't murder'.
Which makes perfect sense, since the same text spells out capital punishment for a number of crimes.
Use your head.
Moses spoke Hebrew, not King James' English. Learn to read it and do your own translation.
We are arguing from a Biblical basis; therefore, following the commandments means that punishing the guilty is not murder. Murder is the willful taking of innocent life. If you want to argue about the possible errors made in trying and sentencing alleged criminals, then start another thread.