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.
It varies state to state but typically you are convicted of capitol murder. Usually they will only go for the death penalty if it is felt that it will be supported by the judge with the understanding there is no doubt regarding rehabilitation. by the way IANAL 630:1 Capital Murder.