Troy Davis was convicted of murder solely on the basis of witness testimony, and seven of the nine non-police witnesses have since recanted or changed their testimony, several citing police coercion. Others have signed affidavits implicating one of the remaining two witnesses as the actual killer. But due to an increasingly restrictive appeals process, none of this new evidence has ever been heard in court.
On October 14, the U.S. Supreme Court declined to hear Davis' appeal. This decision means that no court of law will ever hold a hearing on the witnesses who have recanted their trial testimony. An execution under such a cloud of doubt would undermine public confidence in the state's criminal justice system and would be a grave miscarriage of justice.