The death penalty does not make the executioner a killer, the murder choosing to plan and take a life makes him the taker of his own life by choosing to take another. Capital murder (i.e. A murder plus a felony), should be a death sentence or give them the choice to be locked away in solitary confinement for the rest of their lives with no commissary, no visitors, no TV, no Radio, no xbox, no contact, no book deals. Nothing but 3 square meals a day and complete isolation 360 days a year. 

I know this may sound harsh, but murder is as harsh as it gets.