Fourth and final Arkansas inmate Kenneth Williams executed

Kenneth Williams put to death by lethal injection after appeal to US supreme court fails to secure a stay on his sentenceKenneth Williams’ attorneys have appealed to US supreme court to stop his execution on grounds of intellectual disability. Photograph: AP
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Arkansas has carried out its fourth execution within a week, bringing to a troubling end the state’s controversial attempt to run a “conveyor belt of death” in an aggressive burst of killings unseen in the US for