What does the Quran say about murder?

Living in America I’m surrounded by stereotypes and assumptions concerning Muslims and this supposed mission to kill all non-believers (which, apparently I’m suppose to believe is all Americans and Jews 😛 ), but I want to know what’s the real deal on all this. I know Muslim isn’t a race, it’s a religious group, so what does the Qur’an say about murder, or killing of innocent people?