LEXINGTON, Ky. — A Lexington woman has been sentenced to 30 months in federal prison for threatening to kill U.S. Senator Mitch McConnell of Kentucky.U.S. District Judge Jennifer B. Coffman handed down the punishment for 50-year-old Susan Mary Collins Thursday for mailing a threatening communication.Collins previously pleaded guilty to sending the letter on September 2 threatening to kill the U.S. Senate’s top Republican.According to Collins’ plea agreement, McConnell perceived her letter as a genuine threat that could cause him harm.Collins will have to serve 85 percent of her prison sentence.