TULSA, Okla. (AP) - A former Oklahoma volunteer sheriff's deputy convicted of fatally shooting an unarmed man has again been denied bail while he awaits sentencing.

The Tulsa World  reports that the Oklahoma Court of Criminal Appeals denied Robert Bates' appeal Friday. A Tulsa County District judge denied Bates' bail request on May 3.

The 74-year-old had cited medical issues as a reason he should be released, but the judge said state law prohibits bail on appeal for those convicted of a felony while possessing a firearm.

Bates was convicted April 27 of second-degree manslaughter in the shooting of Eric Harris during an illegal gun-sales sting. Bates said he mistook his handgun for his stun gun.

A jury has recommended that he serve four years in prison. Sentencing is scheduled for May 31.