Florida death row inmate Freddie Lee Hall challenged the state's use of an IQ cutoff to determine mental disability. The Supreme Court sided with him on Tuesday, saying Florida's law doesn't take standard errors of measurement into account. Florida Department of Corrections/AP hide caption

itoggle caption Florida Department of Corrections/AP

Death penalty opponents set up signs April 23 at the Florida State Prison near Starke, Fla., just hours before the execution of Robert Eugene Hendrix, 47, who killed his cousin and his cousin's wife to prevent him from testifying in a burglary case against him. Phil Sandlin/AP hide caption

itoggle caption Phil Sandlin/AP

Oklahoma Gov. Mary Fallin issues a statement to the media after the execution of Clayton Lockett. Oklahoma Secretary of Safety and Security Michael C. Thompson stands behind her at the Oklahoma State Capitol in Oklahoma City. Alonzo Adams/AP hide caption

itoggle caption Alonzo Adams/AP

Relatives of defendants gather outside the courthouse in the central Egyptian city of Minya on Tuesday. Some 700 Islamists charged with deadly rioting were on trial. The day before, the court sentenced 529 men to death for killing a policeman. AFP/Getty Images hide caption

itoggle caption AFP/Getty Images

This is the execution room at the Potosi Correctional Center in Potosi, Miss., as it looked on Jan. 17, 1990. Death by lethal injection was the method used at the prison. AP hide caption

itoggle caption AP