Death Penalty and Human Rights Standards

The Amnesty International gives a timeline about the UN and the death penalty. One important year was in 2007, when the UN General Assembly apporved Resolution 62/149 which called for all states that still maintain the death penalty to establish a moratorium on executions with a view to abolishing the death penalty.
http://www.amnestyusa.org/our-work/issues/death-penalty/international-death-penalty/death-penalty-and-human-rights-standards