"Felony murder" is a specific crime, and not some generic term. It's when someone is killed during your crime but that you didn't cause the death directly. In those cases, you can be charged with murder (and it's very much a murder charge, not a manslaughter charge) anyway, simply because you set into motion the circumstances that would lead to that criminal killing. Often, when that charge is leveled, you have all sorts of silly liberals defending them "well, he didn't fire the shot himself, blame the other guy" and crap like that.
I keep forgetting that most people don't seem to have much interest in this, nor do they understand any of these crimes. Murder's just an interchangeable word for "someone was killed" for most of you. It's sort of embarrassing. Don't you feel bad that your vote counts as much as mine?