Ketamine was first developed in 1962. It is on the World Health Organization's List of Essential Medicines, the most important medication needed in a basic health system. It is legally sold under a very wide variety of brand names, including Ketalar.
If the crime you commit (generally just first degree murder) is in a state that does not have the death penalty then the only way you can be executed is if you are tried in a federal court as opposed to a state court.
In a capital felony trial in which the state does not seek the death penalty, prospective jurors shall be informed that the state is not seeking the death penalty and that a sentence of life imprisonment is mandatory on conviction of the capital felony.