Freddie “Khalil” Owens. Marcellus “Khaliifah” Williams. Emmanuel Littlejohn. Travis Mullis. Alan Eugene Miller. All five men were executed within one week in five different states, a period political scientist Austin Sarat condemned as “the worst execution spree in three decades.” The most high-profile execution took place on Tuesday when Missouri executed Marcellus Williams, who had maintained his innocence for decades.