Washington (AFP) – A man convicted of carrying out a double murder was put to death by lethal injection Thursday in Oklahoma, becoming the first prisoner executed in the United States this year. The southern state’s execution of Donald Grant “was carried out with zero complications at 10:16 this morning (1616 GMT),” Oklahoma attorney general John O’Connor’s office said in a statement. The 46-year-old’s last words were barely intelligible. In 2001, Grant, then aged 25, robbed a hotel to steal bail money for his imprisoned girlfriend. During the robbery, he opened fire on two hotel employees. On…