Associated Press
The Huntsville "Walls" Unit of the Texas Department of Criminal Justice Huntsville Unit, where the death chamber is located, is shown Wednesday, June 26, 2013, in Huntsville, Texas. Kimberly McCarthy, who would be the 500th person executed in Texas, is set to be executed Wednesday night, barring a reprieve. More than three decades after the Supreme Court cleared the way for the death penalty to resume in the United States, Texas prepares to execute its 500th inmate. (AP Photo/David J. Phillip)

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