Duane Edward Buck (born July 5, 1963) is an African-American man formerly on death row following his conviction for the shooting deaths of his ex-girlfriend Debra Gardner and her friend Kenneth Butler. He also wounded his sister, who was also at Gardner's home. On August 20, 2015, the United States Court of Appeals for the Fifth Circuit rejected hearing the question of race being allowed as a deciding factor for executing the guilty. The 5th denied a certificate of appealability because Buck did not show extraordinary circumstances.