The difference between killing and murdering

[Kor]

Due to some recent stories, I started to wonder about this issue.
Every country probably has its own rules regarding this matter, but where do you draw the line between a kill and a murder?

EDIT: some stuff that I'm wondering about is killing someone while being drunk or killing someone during a war (a soldier kills the enemy under the command of his commander), and stuff along these lines. (I'm using the word "kill" not in meaning of saying "it's a kill and not a murder" but just because it's an easier and more general word to use)

[GinRei]

Kill is the all-purpose word for when one person causes another's death.  Of course, it can also be applied to non-living things (ie: "Killing time").

Murder depends on the law, but killing someone under whatever way it's defined in said law would constitute murder.  Usually that implies that there was malice.  Also, premeditation or committing it during another crime constitutes murder as well.

As far as drunk driving goes, that constitutes manslaughter, wherein you kill someone with no malice.