Eight days before her mother's body was found buried in a shallow grave in South Whitehall Township, 14-year-old Jamie Silvonek was overheard talking on the phone to her 20-year-old boyfriend, Caleb Barnes, about how they could kill her because she objected to their relationship.

"I want her gone," the eighth-grader texted to Barnes before the killing.Police on Thursday charged Silvonek as an adult with first-degree homicide, abuse of a corpse, tampering with physical evidence and criminal conspiracy in the death of her mother, Cheryl L. Silvonek, 54. Cheryl was a graduate of Jim Thorpe High School.Police believe that Barnes, a soldier on leave from Fort Meade, Maryland, stabbed Cheryl Silvonek to death in the early morning hours of March 15 while they and Jamie sat in her car in the driveway of the family's 1516 Randi Lane, Orefield, home.Police charged Barnes with homicide, abuse of a corpse, tampering with physical evidence and criminal conspiracy. He previously was charged with homicide, one count of statutory sexual assault of a juvenile and abuse of a corpse.They withdrew the charge of statutory sexual assault of a juvenile because Jamie is now a defendant in the homicide, and the commonwealth cannot prove that charge without her testimony, Lehigh County District Attorney James B. Martin said in a press release Thursday afternoon.Jamie, who has been held in juvenile detention, was taken to the Lehigh County Jail to be arraigned in the Central Booking Center.An affidavit of probable cause includes chilling text messages exchanged on March 14 between Jamie and Barnes, who turns 21 on Sunday.Bloodied carIn the messages, Jamie, who told Barnes she was 17, urges Barnes to tell her mother he is 16 1/2."She needs to go, Caleb. Right now. You don't understand," Jamie texted to Barnes.In another message to Barnes she says "I just need to you (sic) be able to come over so we can do whatever necessary, honestly."The crime began to unfold at 4:15 p.m. March 15, when South Whitehall Township police were called to a report of a car with a large amount of blood in it near 5702 Haasadahl Road Orefield.When they arrived, there was no vehicle. Police noticed an area of ground in the woods near Jordan Creek, across from 5702 Haasadahl Road, had been disturbed, with loosely packed dirt and snow. A short time later, they found Cheryl Silvonek's body.At about 7 p.m. they found a 2007 Ford Freestyle a short distance away, near Applewood and Huckleberry roads. It had been driven off the road and was partially hidden by brush near a pond and matched the description of the bloodied car they had been called about.Found in bedroomThe car was registered to Jamie's father and Cheryl's husband, David Silvonek. Police went to the home, where they found Jamie naked in bed with Caleb Barnes in an upstairs bedroom.Jamie told police her mother had dropped her off at the house late the previous night, then left to go grocery shopping, and that she hadn't seen or spoken to her since.Barnes told police he had driven to the Silvonek's from Maryland the previous day, and that Cheryl had driven him and Jamie to a concert in Scranton.When they got back to the house, Barnes told police, he stabbed Cheryl in the neck, killing her, as the three sat in the car in the driveway.Jamie at first denied knowing anything about her mother's death.Shortly after, she recanted, telling police she was there when Barnes stabbed Cheryl to death, that she then went with him to the Walmart store in Trexlertown to get bleach and other cleaning supplies, and then to bury Cheryl's body.She drove with Barnes in her mother's car back home, where they poured bleach into the interior, then drove the car to the Applewood Lane intersection, then walked home, she told police.Her fingers had several small scrapes, her right hand was cut, and a fingernail was broken.Police learned Jamie met Barnes at a concert in Philadelphia on Oct. 2, and that she told him she was 17.They communicated daily via texts, phone calls and social media, and met in person several times when Jamie was visiting relatives in Carbon County.Planned to killboth parentsBarnes met Cheryl on March 6. When Cheryl learned he was 20, she told Barnes and her daughter to end their relationship. Barnes went back to Fort Meade the next day.On March 7, a juvenile at the Silvonek home overheard Jamie talking on the phone with Barnes, suggesting a plan to him to kill her parents.They would lure her parents away from home to a place where Barnes could kill them, then meet Jamie to dispose of the bodies. They talked about life insurance proceeds from Jamie's father, and who would gain custody of her if her parents were killed.Early on March 14, Barnes drove from Fort Meade to the Silvonek home with tickets to a concert in Scranton. As he drove, Jamie was taking PSAT tests. Later that morning, she texted him, telling him to lie to her mother about his age.She also exchanged texts with Cheryl, who told her she did not want Barnes at the house and that she was not going to the concert with him. She then relented, telling Jamie she would take her to the concert and Jamie could meet Barnes there.By 1:30 p.m., Jamie texted Barnes that she wanted her mother "gone."At the family home, Cheryl showed Barnes her daughter's passport to prove she was 14, not 17. Barnes, texts reveal, was increasingly skeptical of Jamie's statements that she was 17.More text messages from Jamie to Barnes between 4 p.m. and 5 p.m. March 14 suggest a plan was forming."I'm going to go to the bathroom while you do it OK," she texted to him. "I'll come right out as soon as you're done."Then, "Why don't we wait until we get in the car with her?" she texted."Fine," Barnes replied.Another flurry of texts close to 6 p.m. March 14:"I love you. We can do this," Jamie texted. "We'll just drive her car then, right?""No. That leaves us as the suspects," Barnes responded.