A judge in Ohio is holding hearings Monday on the constitutionality of the state's lethal injection procedure.

The judge is expected to hear testimony from two anesthesiologists who disagree whether the drugs used to execute prisoners cause excruciating pain.

Two men facing murder charges in the county are challenging the lethal injection procedure. They are being represented by the American Civil Liberties Union.

Lethal injections are on hold nationally while the U.S. Supreme Court considers a challenge in a case from Kentucky, which is among the states that administer three drugs in succession to knock out, paralyze and kill prisoners.

Virginia Governor Tim Kaine stayed the execution set for Tuesday night for Edward Bell, who killed a Winchester police officer in 1999. He ordered a moratorium on executions in Virginia until the high court rules on whether lethal injection is constitutional.