The "pro life" term was, originally, identified with the anti abortion movement, which still seems the most appropriate context.
In the context of the facts, yes, of course you can be pro life and pro death penalty. There is no contradiction.
Based upon biblical and theological teachings, as well as secular realities, one can, reasonably and responsibly, find that an anti death penalty view is not pro life. See below.
All sanctions are given because we value what is being taken away.
Whether it be fines, freedom or lives, in every case we take things away, as legal sanction, it is because we value that which is taken away.
How can it be a sanction, if we do not value that which is taken away? It can't.
In addition, more innocent lives are saved when we use the death penalty, thereby a pro life benefit. See below.
There is the well known Genesis passage, reviewed below, wherein the death penalty is based upon life being sacred. Genesis is for all peoples and all times.
In addition, there is Numbers 35:31 which states that there can be no reduction in sentence for murder, that the murderer must be executed. All other crimes are subject to reduced sentences.
The good thief on the cross stated the two thieves were being justly executed for their crimes. Jesus did not reply "you should not be executed". His reply was that the good thief would attain eternal salvation. The concern seems not the manner of our earthly deaths, but our state of redemption and salvation at the time of our deaths - the concern for eternal life - the ultimate pro life consideration.
The ultimate in reconciliation.
The moral and religious arguments, in support of the death penalty, all have a foundation in respecting innocent life, therefore, when it is wrongly taken away, the highest form of sanction is provided.
Genesis 9:5-6: "For your lifeblood I will surely require a reckoning.... Whoever sheds the blood of man, by man shall his blood be shed; for God made man in his own image."
Chapter V:The Sanctity of Life, "Principles of Conduct: Aspects of Biblical Ethics" By John Murray, 1991 (first published 1957) by Wm. B. Eerdmans http://tiny.cc/4SFBY
"Death Penalty Support: Christian and secular Scholars"
Christianity and the death penalty
Catholic and other Christian References: Support for the Death Penalty
"Killing Equals Killing: The Amoral Confusion of Death Penalty Opponents"
"The Death Penalty: Neither Hatred nor Revenge"
"The Death Penalty: Not a Human Rights Violation"
THE DEATH PENALTY: SAVING MORE INNOCENT LIVES
Of all endeavors that put innocents at risk, is there one with a better record of sparing innocent lives than the US death penalty? Unlikely.
In three ways, innocents are more protected with the death penalty, than with lesser sanctions.
Another pro life consideration.
1) The Death Penalty: Saving More Innocent Lives
2) Innocents More At Risk Without Death Penalty
3) LIFE: MUCH PREFERRED OVER EXECUTION
99.7% of murderers tell us "Give me life, not execution"
4) OF COURSE THE DEATH PENALTY DETERS
5) Deterrence, Death Penalties & Executions