Irked that the case of an Arizona rancher accused of killing an illegal immigrant is taking longer than he wanted, the judge in the case stalked out of the courtroom Thursday. George Alan Kelly, 75, is on trial for a second-degree murder charge in connection with the shooting death of an illegal immigrant last year. Judge Thomas Fink left the courtroom after venting his frustration over the pace of the trial and then cutting back the time the defense has to question a witness, according to Newsweek. “I’m gonna start imposing time limits in this case on direct and cross-examinations,” Fink said…