Troy Davis has now been executed, an event that has brought much criticism of America's continued use of capital punishment.
Those looking for new reasons to oppose the death penalty should consider looking at my “Retributivist Arguments against Capital Punishment,” Journal of Social Philosophy 35 (2004): 188-97 and my “Retribution and Capital Punishment,” in Mark D. White (ed.), Retributivism: Essays on Theory and Practice. Oxford: Oxford University Press, 2011, pp. 232-45.