Thirty-one people, all male, were executed in the United States in 1992, twenty-one by lethal injection, eight by electrocution, and two by gas chamber. Six particularly notable executions were those of Rickey Ray Rector, Robert Alton Harris (the first execution in California since 1967), Steven Brian Pennell (the first execution in Delaware since 1946), Donald Harding (the first execution in Arizona since 1963), Mark Allen Hopkinson (the first and currently the only execution in Wyoming since 1965), and Roger Keith Coleman. Coleman was controversially executed by Virginia despite serious doubts about his actual guilt. However, in 2004, posthumous DNA testing confirmed his guilt.