Jeen "Gina" Han, 44, was convicted in 1998 of plotting to kill her twin sister, Sunny Han, in a case that made international headlines. She has served nearly 20 years behind bars.
Jeen Han and two others were convicted for conspiracy to commit murder, burglary and false imprisonment.
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Prosecutors said the three plotted to kill Sunny Han, who was rescued by police after she was found tied up alongside her roommate.
Jeen Han was sentenced to 26 years to life in state prison.
Orange County District Attorney Tony Rackauckas called Jeen Han a "manipulative and dangerous individual" and asked Gov. Jerry Brown to reject her parole.