Attorneys for death row inmate Warren Lee Hill will be back in court to challenge the constitutionality of a Georgia law prohibiting the release of information on where the state acquired its supply of a lethal injection drug.

Thursday's hearing will be in Fulton County court. Hill's attorneys are expected to raise questions about the use of an unidentified compounding pharmacy to supply the drug as they seek to delay Hill's execution set for Friday.

Hill's attorneys have also appealed to the U.S. Supreme Court, arguing he is mentally disabled and shouldn't be executed.

Attorneys for the state say Hill has failed to prove he's mentally disabled and that his case has been thoroughly reviewed by the courts. Hill was sentenced to death in the killing of a fellow inmate.

Tags: death penalty, execution, lethal injection, execution drug, lethal injection drug, Georgia death penalty, Warren Lee Hill, compounding pharmacies, pentobarbitol