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.
Illinois Statutes Section 5/9-1 (first degree murder) Penalties and Sentencing: Illinois is no longer a death penalty state so the maximum punishment for first degree murder is life imprisonment. Before it was repealed in 2011, punishment in a capital murder case would be determined at a sentencing hearing during which the judge would hear evidence on aggravating and mitigating factors.