Three men accused of killing a 10-year-old Carter County girl in a drive-by shooting pleaded guilty in criminal court Thursday morning.Jason Barber II and Jediah Glover, both of Jonesborough, took a plea agreement for 40-year sentences in connection to the death of Lillyhanna Davis, who had been sleeping on the couch inside her home when she was shot. Zachary Scalf entered a plea for a 15-year sentence for the facilitation of second-degree murder, according to District Attorney General Kenneth C. Baldwin.