First my sincere apologies for several things.
Firstly, I don't think its a good idea to raise such a sensitive and serious subject on a Memorial Day weekend but I just could not resist.
Secondly, its possible that death penalty had been discussed here before but I thought, that the link I will post here might want you to put the two-Bible and death penalty-on a different perspective.
Lastly, I don't mean to hurt any particular individual, group or religious beliefs. My basic premise to post the subject is to share something I found interesting and probably valuable.
I look forward to your comments on the same.
Overview:
The Hebrew Scriptures (Old Testament) said a great deal about the death penalty. The Torah (the first 5 books of the Bible) required this punishment for many transgressions, both civil and religious. Death was usually by stoning, although one crime required that women be executed by being burned alive. Few executions were actually performed. The court procedures required overwhelming evidence of guilt before a person could be executed. For example, there had to be two eye-witnesses before the accused could be given the death penalty. There were also instances where God murdered individuals for various activities: Onan avoided getting his former sister-in-law pregnant by practicing birth control. Lot's wife looked back at her city when it was being destroyed, etc.
The Christian Scriptures (New Testament) do not contain new codes of law which govern the death penalty. However, there were many references to capital punishment in the Bible and in non-canonical literature which indicate that the Hebrew Scripture's codes were still being applied during the time of Jesus.
Two conflicting penalties for murder in the book of Genesis
Both instances of murder refer to an era that preceded the 613 commands of the Mosaic law code.
The first mention of the appropriate punishment for a murder is in Genesis 4:11-15.
"And now art thou cursed from the earth, which hath opened her mouth to receive thy brother's blood from thy hand;...a fugitive and a vagabond shalt thou be in the earth. And the LORD said unto him, Therefore whosoever slayeth Cain, vengeance shall be taken on him sevenfold. And the LORD set a mark upon Cain, lest any finding him should kill him." (KJV)
Adam and Eve's sons were Cain, a farmer, and Abel, a shepherd. Each brought the best that they had had produced as a sacrifice to God. God accepted Abel's sacrifice of meat but rejected Cain's grain offering. Cain's resultant disappointment turned to anger; he killed his brother. God cursed Cain for the murder and sent him to wander the earth. God also put a mark on Cain's body so that nobody who saw him would be motivated to kill him. If anyone killed Cain for the murder of his brother, that person would be very severely punished. Here, banishment and exile is the penalty for murder; capital punishment is specifically prohibited.
The first mention of capital punishment as a penalty for murder is in Genesis 9:6:
"Whoso sheddeth man's blood, by man shall his blood be shed: for in the image of God made he man." (KJV)
This passage regards the killing of a human as an offense against God because humans were made in the image of God, both male and female. Unlike the previous passage which required that the murderer be merely exiled, this verse required the murderer to be killed.
http://www.religioustolerance.org/exe_bibl.htm