Washington (AFP) - The southern US state of Alabama on Thursday put to death a convicted murderer using nitrogen gas, the first time the controversial method criticized by human rights advocates has been used in the country. Kenneth Eugene Smith was pronounced dead at 8:25 pm (0225 GMT Friday), according to the state attorney general. "Justice has been served. Tonight, Kenneth Smith was put to death for the heinous act he committed over 35 years ago," the statement by Attorney General Steve Marshall said. Smith, 58, was on death row for more than three decades after being convicted of the 1988...