A man convicted of killing three people at a Columbia convenience store 12 years ago goes back to the coutroom for the third time today. Ernest Lee Johnson’s guilt is not the issue. But his death sentence has been overturned twice by the State Supreme Court – the first time because his defense lawyer didn’t give the jury enough information about Johnson’s history of drug addiction and deprivation; the second time after the U.S. Supreme Court ruled in another case that executing a retarded person is unconstitutional. Johnson’s lawyers say he is mildly retarded. Jurors from Pettis County will make the decision this time.