[gpapa]

Thou shalt not kill [Ex 20:13]

You have heard that it was said to the men of old, "You shall not kill: and whoever kills shall be liable to judgment." But I say to you that every one who is angry with his brother shall be liable to judgment. [Mt 5:21-22]

[John O]

both instances you provided hold the general meaning "murder, slay, kill"

Contrast this with the levitical "Put to death" (say Lev 20:12 for example).

The use of "murder" in place of "kill" in Ex 20:13 and Mt 5:21-22 would be a translation far more consistent with the rest of the bible (and still holds true to the original words)