tuesday when the georgia pardons and parole board rejected his clemency bid. then the u.s. supreme court also allowed the date to pass without granting a stay. >> i have been through hell. especially the last couple years, when everything was kind of building up and we had to go to court again and again. so, i need some peace. >> reporter: davis is the latest in a series of executions some of which have raised serious questions. lawrence russell brewer was also executed for dragging a black man behind his truck. then cleve foster in alabama and duane buck in texas, both spared execution in the past week when the supreme court stepped in. for davis, the campaign ran into the final hours. davis had high profile list of supporters, including big boi of the group outkast. and quest love of the roots. also, backing his clemency request were former president jimmy carter and the pope. >> it's hard to believe that many witnesses came forward and