For decades, who executed St. Paul police officer James Sackett was considered to be an open secret. But making the case of a 1970 ambush killing that came during a fiery time of race riots and open hatred toward police would be "a long, slow process of hard investigation," predicted the police chief at the time. Prosecutors and police unsealed indictments Saturday against two men who were suspects almost from the beginning. Authorities wouldn't say what the break in the case was, but hinted at the testimony of witnesses who hadn't come forward or been willing to talk. "I don't...