Georgia Diagnostic and Classification State Prison in Butts County, Georgia. (Credit: NeilATL via Wikimedia Commons) Georgia Diagnostic and Classification State Prison in Butts County, Georgia. (Credit: NeilATL via Wikimedia Commons) 

Attorneys for a Georgia inmate sent to death row 25 years ago are accusing a prosecutor of hiding a deal that they contend casts doubt on the credibility of a crucial trial witness.

Warren King was sentenced to death in September 1998 after an Appling County jury convicted him of murdering Karen Crosby, a convenience store clerk who was fatally shot during an armed robbery in southeast Georgia.

Now, King's lawyers say they have evidence that the assistant district attorney who prosecuted the case, John B. Johnson, made a previously undisclosed deal with the only eyewitness to the crime. They're asking a Superior Court judge in Butts County, home of Georgia's death row, for a hearing in hopes of King getting a new trial.