Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Virginia is poised to execute a convicted serial killer who claims he's intellectually disabled using lethal injection drugs from Texas because the state's supply of another controversial drug will expire the day before the execution is supposed to take place. Unless Gov. Terry McAuliffe or the U.S. Supreme Court steps in this week, Alfredo Prieto will be executed Thursday - the first Virginia inmate to be receive the death penalty in nearly three years. The El Salvador native was already facing execution in California for raping and murdering a 15-year-old girl when a Virginia jury sentenced him to death in 2010 for the 1988 killings Rachael Raver and her boyfriend, Warren Fulton III.Alfredo Prieto raped and murdered a 15-year-old girl in CaliforniaHe also murdered a Virginia couple in 1988 and will be executed ThursdayPrieto claims he has a 'significant brain dysfunction' from a malnourished childhood in El Salvador but psychologists say he is brightThe state will use a lethal three-drug cocktail partially supplied by TexasVirginia has executed 110 people since 1976, the third highest state 
 Question:They want Prieto to return to _, where they believe he can receive a 'full and fair' assessment of his intellectual disability.

California