Helps if you read it.
Genesis 9:5-6
5 And surely your blood of your lives will I require; at the hand of every beast will I require it, and at the hand of man; at the hand of every man's brother will I require the life of man.
6 Whoso sheddeth man's blood, by man shall his blood be shed: for in the image of God made he man.
Exodus 21:12-14
12 He that smiteth a man, so that he die, shall be surely put to death.
13 And if a man lie not in wait, but God deliver him into his hand; then I will appoint thee a place whither he shall flee.
14 But if a man come presumptuously upon his neighbour, to slay him with guile; thou shalt take him from mine altar, that he may die.
Leviticus 24:17
17 And he that killeth any man shall surely be put to death.
Numbers 35:16-19, 30-31 (excerpt)
16 And if he smite him with an instrument of iron, so that he die, he is a murderer: the murderer shall surely be put to death.
17 And if he smite him with throwing a stone, wherewith he may die, and he die, he is a murderer: the murderer shall surely be put to death.
18 Or if he smite him with an hand weapon of wood, wherewith he may die, and he die, he is a murderer: the murderer shall surely be put to death.
19 The revenger of blood himself shall slay the murderer: when he meeteth him, he shall slay him.
30 Whoso killeth any person, the murderer shall be put to death by the mouth of witnesses: but one witness shall not testify against any person to cause him to die.
31 Moreover ye shall take no satisfaction for the life of a murderer, which is guilty of death: but he shall be surely put to death.
While we as Christians are not under mosaic law, its still the "model" of government set up by God.