Jamie Silvonek will be sentenced to 35 years to life in prison, the Lehigh County District Attorney’s office said.
As part of the deal, Silvonek pleaded guilty to first-degree murder, criminal conspiracy, abuse of a corpse, and tampering with evidence. She will be eligible for parole after serving 35 years.
Silvonek, who was charged as an adult, was accused of conspiring with 21-year-old army special Caleb Barnes via text to kill her mother in the driveway of her home near Allentown last March after the three returned from a concert.
Barnes stabbed the 54-year-old Cheryl Silvonek, then he and the teenager ate at a restaurant and went shopping for gloves, bleach and other cleaning supplies, authorities said.
Barnes’ trial is set for April 11. He is charged with homicide, abuse of a corpse, tampering with physical evidence, and conspiracy.