The Supreme Court says condemned inmate Troy Davis should get another chance to prove his innocence before the state of Georgia executes him.

SAVANNAH, Ga. (AP) - Supporters of death-row inmate Troy Davis are calling for Chatham County’s new district attorney to reopen the case against the convicted cop killer.

Mark MacPhail’s son tells us it’s been two decades since his father’s murder and says news about the appeal is what they’ve been waiting to hear for a long time.

Georgia death row inmate Troy Davis has already been spared from execution three times. On Tuesday, his lawyers hope to push his extraordinary case one more step toward his exoneration when they ask a federal panel to let them file another appeal of his death sentence.