A preliminary hearing has been set for a 14-year-old Upper Macungie Township girl and her boyfriend who are accused in the brutal stabbing of a Jim Thorpe native.

Jamie Lynn Silvonek and Caleb Gregory Barnes are scheduled for the hearing in Cheryl L. Silvonek's death at 10:30 a.m. April 16 before District Judge Michael Faulkner in Upper Macungie Township.Barnes, U.S. Army specialist stationed at Fort Meade, Maryland, is accused of fatally stabbing Cheryl Silvonek in the early morning hours of March 15 as the three sat in a 2007 Ford Freestyle in the family's driveway at 1516 Randi Lane, Upper Macungie.An affidavit of probable cause says Barnes and Jamie Silvonek buried her mother's body at 5:55 a.m. March 15 in the 5700 block of Haasadahl Road, South Whitehall Township.Lehigh County Coroner Scott Grim, who ruled Cheryl Silvonek's death a homicide, said the cause of her death was due to multiple stab wounds to her neck.An autopsy also showed she had contusions, abrasions and sharp-force injuries to her head, neck, torso and extremities.The 2007 Ford Freestyle was found at 7:13 a.m. the same day partially obscured by vegetation near a pond in the area of Applewood and Huckleberry roads.Lehigh County District Attorney Jim Martin credited the David M. Petzold Digital Forensics Laboratory of Lehigh County on the campus of DeSales University, and the Lehigh County Regional Intelligence and Investigation Center in Allentown with finding evidence extracted from cellphones and analyzed by investigators, which court papers say reveal what happened before the fatal stabbing.Detectives also analyzed video footage, Martin said.South Whitehall and Upper Macungie police and a detective with the Lehigh County Homicide Task Force interviewed Jamie Silvonek, Barnes, neighbors and another juvenile.Lies about ageA forensic examination of Jamie Silvonek and Barnes' cellphones indicates she talked about planning her mother's death, Martin said.He said other messages indicate Jamie Silvonek lied to Barnes about her age and she wanted him to lie to her mother about his age.According to the affidavit of probable cause, Jamie Silvonek met Barnes at a concert in Philadelphia in October 2014, at which time she told Barnes she was 17 years old.During the subsequent months, the two communicated daily by voice, text and social media and met on several occasions in Carbon County while she was visiting family.Cheryl Silvonek met Barnes for the first time on March 6.The affidavit states when Cheryl Silvonek learned Barnes was 20 years old, she instructed her daughter and Barnes to end the relationship.On the evening of March 7 after Barnes returned to his Army base, Jamie Silvonek and Barnes had a cellphone conversation in which Silvonek suggested a plan to kill her parents, according to another juvenile who was at the Silvoneks' home, court records say.The plan involved luring her parents away from their home so Barnes could kill them and then rejoin Jamie Silvonek to dispose of the bodies, the affidavit states.The conversation also included a discussion of life insurance proceeds from Silvonek's father and who would get custody of Jamie Lynn Silvonek, if both her parents were killed.Prior to March 14, Barnes purchased two tickets for the 8:30 p.m. Breaking Benjamin concert at the Hilton Hotel in Scranton.According to the affidavit, Barnes left the Fort Meade area for the Silvonek home the morning of March 14.At that time, Jamie Lynn Silvonek, an eighth-grader at Orefield Middle School, was taking a standardized test.According to the affidavit, at 11:05 a.m. that day Cheryl Silvonek called Barnes on his cellphone.At 11:12 a.m. the same day, Jamie Silvonek started texting Barnes telling him to tell her mother he was 16-1/2 years old.Jamie Lynn Silvonek and Barnes also sent messages to Cheryl Silvonek telling her someone else was going to the concert with them, at which time Cheryl Silvonek reportedly texted back, "He (Barnes) is not coming to this house," the affidavit states.Jamie Silvonek then texted Barnes, "She needs to go, Caleb. Right now. You don't understand."Jamie Silvonek texted Barnes at 1:30 p.m., "She threatened to throw me out of the house. I want her gone," the affidavit states.At about 2 p.m. Barnes arrived at the Silvonek home and he and Cheryl Silvonek had a discussion in which she tried to convince him her daughter was 14 years old and not 17 by showing him her passport.At 2:25 p.m. Cheryl Silvonek texted her husband, David, their daughter's friend (Barnes) had gotten tickets to a concert in Scranton and she would be driving them.According to the affidavit, at 4:27 p.m., Jamie Silvonek wrote: "I'm going to go to the bathroom while you do it okay. I'll come right out as soon as you're done."At 4:42 p.m., she wrote, "Why don't we wait until we get in the car with her?" Barnes replies, "Fine.""That would be easier for you," Jamie Silvonek texted. "I guess," Barnes replied.At 5:14 p.m., Jamie Silvonek wrote, "Just do it."A flurry of text messages indicate Jamie Silvonek tried to convince Barnes her mother was lying about her age and Barnes had doubts about Jamie's age.In a text, he wrote, "There's no way she could fake a passport," the affidavit states.According to the affidavit, at 5:36 p.m., Jamie Lynn Silvonek texted Barnes, "I need to talk to you," and told him to go to the basement.'We can do this'At 5:56 p.m., the Ford Freestyle entered the Pennsylvania Turnpike Toll Plaza going north toward Scranton.A minute later, Jamie and Barnes began texting each other while in the Silvonek vehicle headed to Scranton.Jamie texted, "I love you. We can do this. … We'll just drive her car then, right?"Barnes replied, "No. That leaves us as the suspects."According to the affidavit, Silvonek's vehicle exited at the Wyoming Valley toll plaza at 6:41 p.m.Video footage from the Hilton Hotel shows Jamie Silvonek and Barnes enter the concert at 8:32 p.m. and leave at 10:24 p.m., the affidavit states.Additional footage shows Cheryl Silvonek in the lobby area of the hotel during the concert.According to the affidavit, Cheryl Silvonek's car was seen entering the Wyoming Valley toll plaza at 11:03 p.m. and exiting the Lehigh Valley toll plaza at midnight.Video footage at Chris's Family Restaurant on Tilghman Street, shows Jamie Silvonek and Barnes entering the restaurant at 12:02 a.m. and leaving around 12:45 a.m.At 1 a.m. neighbors reported hearing a car horn blowing intermittently for about 20 to 30 minutes from a vehicle parked at the Silvoneks' home.One neighbor reported seeing Jamie Silvonek walk unaccompanied from the vehicle into the garage at at 1:35 a.m., the affidavit states.Video shows Jamie Silvonek and Barnes enter the parking lot at Walmart, Lower Macungie Township, in Barnes' silver Chevrolet Camaro and enter the store at 2:08 a.m.Jamie Silvonek is seen in the video physically grabbing Barnes' arm and directing him inside the store, where they purchased gloves, bleach, rubbing alcohol, a box cutter and a file.At 2:31 a.m. they left the store, about 90 minutes before police were dispatched to Haasadahl Road and about three and half hours before police found Cheryl Silvonek's body, the affidavit states.According to the affidavit, when officers responded to the Silvonek home, after Cheryl Silvonek's body and car were found, Jamie Silvonek was found with Barnes in an upstairs bedroom.The affidavit states when Jamie Silvonek was questioned about her mother's whereabouts, detectives saw she had multiple small abrasions on her fingers, a cut on her right hand and a broken fingernail.Silvonek is being represented by John J. Waldron.Barnes is being represented by the Lehigh County Public Defenders Office, court records state.Both have been denied bail and are being held in Lehigh County Prison.