Texas executed 54-year-old Marvin Wilson, despite evidence that he was mentally disabled and reportedly sucked his thumb into adulthood. Wilson's lawyers had argued that an IQ test on which Wilson scored 61 -- nine points below the standard for competency -- should have saved him from execution under a 2002 U.S. Supreme Court ruling barring execution of the intellectually disabled. Wilson is the second prisoner in Texas to be executed by a new lethal injection method involving a single drug.