The Death Penalty

I'm a moderately pro-life libertarian.  I don't really know much about the death penalty yet, and haven't formulated a position on it yet.  My initial inclination is to be against it, but I'm not sure yet.  If anyone has some strong views on this from a libertarian perspective, and would like to influence me, speak up, now is the time. 

A life in jail is a much worse punishment than death. I am against the DP mostly. The only good thing I can see is it doesn't cost as much.