*Troy Anthony Davis‘ lawyers this morning were turned away by prison officials, who rejected their attempt to allow Davis to take a polygraph test to try and show he is not a cop killer, reports ajc.com.

Davis, who has always maintained his innocence, sits on death row for the 1989 murder of off-duty Savannah Police Officer Mark Allen MacPhail. The state Board of Pardons and Paroles denied him clemency early Tuesday. He is set to be put to death by lethal injection at 7pm this evening, GA time.

Meanwhile, Davis’ lawyers also filed a court motion seeking a stay of tonight’s execution in Superior Court in Butts County, home to Georgia’s death row.