Demonstrators opposed to the death penalty sing a religious hymn shortly after the execution of Stanley "Tookie" Williams at San Quentin State Prison in San Quentin, California December 13, 2005. California prison officials executed Williams, 51, co-founder of the Crips gang who killed four people in 1979, early on Tuesday after top courts and California Governor Arnold Schwarzenegger rejected final appeals to spare his life. REUTERS/Lou Dematteis