Nathaniel Gann, 20, and Brae Hansen, 19, were convicted by separate juries two months ago for the murder of 63-year-old Timothy MacNeil on July 19, 2007.
Gann was convicted of first-degree murder and faces a sentence of 25 years to life. Hansen, however, was convicted not only of the murder charge but a special circumstance allegation of lying in wait.
Judge Frederic Link is expected to sentence Hansen to life in prison without the possibility of parole.
The day of the crime, Hansen told police that a masked intruder surprised her and her stepfather and shot the victim four times, including a final shot to the back of the head.
Deputy District Attorney George Bennett said police initially treated Hansen as a victim but arrested her when her story fell apart. Gann was arrested at his Arizona home the next day.
The prosecutor said Hansen was mad at her stepfather and wanted him dead and called her brother, who was then 18, in Arizona to set the plan in motion.
A jailhouse informant testified that Gann told him details of the murder that only the killer would know.
Gann's attorney, Ricardo Garcia, told the jury that the prosecution didn't prove its case beyond a reasonable doubt.
Troy Britt, Hansen's lawyer, said his client tried to back out of the plan but Gann wouldn't let her.
MacNeil's family members said Hansen stood to inherit half of her stepfather's estate and couldn't stand not being the center of attention.
The family believed Hansen promised Gann a cut of the inheritance.
The defendants' mother committed suicide a year before Timothy MacNeil was murdered.