The U.S. Supreme Court is allowing an Arizona execution to go forward amid a closely watched First Amendment fight over the secrecy surrounding lethal injection drugs.

The court ruled in favor of the state of Arizona in the case of Joseph Wood, who was convicted of murder in the 1989 shooting deaths of his estranged girlfriend and her father. Arizona plans to execute him Wednesday.

The 9th U.S. Circuit Court of Appeals had put the execution on hold after ruling the state must reveal information such as how the state developed its method for legal injections, and who makes the drugs that are used.

It's believed to be the first time an appeals court delayed an execution based on the issue of drug secrecy.

Wood argued he has a First Amendment right to the details and that the information is beneficial to the public.