There is a large difference between killing and murder, but our lack of education in English makes it easy to blur the distinction.
Killing can be done by the State as a judicial action; Not Murder.
Killing may also be done by the State as an act of war. Soldiers kill enemy soldiers (and civilians).

Murder is a special subset of killing. As mentioned above, it is a person taking a life with malice and aforethought.

All murders are killings, but not all killings are murder.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags