No. I don't believe the state should have the power to end someone's life. That's my fundamental position. I would also argue that if it did, this is open to abuses of power, corruption, and miscarriages of justice that can never be fixed.
Are there people I wish were dead, and who I think deserve to be killed? Sometimes. But that's not a pleasant thought, and I certainly don't think that my emotions should be carried into action, because it doesn't get humanity anywhere in the long run.