jamie silvonek was charged as an adult with homicide and criminal conspiracy , lehigh county district attorney .
cheryl silvonek , 54 , was fatally stabbed in the driveway of her upper macungie township home early march 15 , hours after taking jamie silvonek and the eighth-grader 's boyfriend , army spc. caleb barnes , to a concert , according to court documents .
barnes , who was on leave from fort meade in maryland at the time of the slaying , was previously charged with homicide .