Her codefendant, Sheila Eddy, was sentenced in January to life in prison with the possibility of parole.
During the sentencing hearing, Shoaf apologized for her actions.
"The person that did that was not the real me.... I became scared, caught up in something that I did not want to do," she told the court.
In Cold BloodBut Skylar's family wasn't buying the remorse.
"Rachel Shoaf murdered my daughter in cold blood," said Dave Neese. "She can take her apologies and sit on them."
The prosecution pointed out during the hearing that Eddy and Shoaf joked about killing Skylar in science class.
Shoaf, who is still 17, will remain in a juvenile facility until she is 18, when a hearing will be scheduled to determine in which state prison she will serve the remainder of her sentence.
Shoaf will be eligible for parole in 10 years, Eddy will be eligible in 15 years.
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Photo: Family Photo