Cain was convicted last month of slashing his elderly cousins to death in their Cerritos home.
The jury that convicted the now 34-year-old Carson man in the special circumstance case -- which included two counts of robbery and two counts of first degree murder -- must now decide whether Cain should be sentenced to life without the possibility of parole or death for the crimes.
Cain has remained in custody without bail since his arrest on March 25, 2004, for the slayings of Lamar and Ernestine Matthews.
The bloodied bodies of the couple, both 75, were found in February of 2004 in separate rooms of the two-story house where they had planned on spending their retirement years.
Cain, who was 28 at the time, became the primary suspect when investigators discovered he had cashed a $6,000 check from the Matthews' bank account the day before they were stabbed to death.
While his defense team is scheduled to begin its portion of the penalty phase Thursday morning, court officials said Wednesday, the case could go to the jury as early as Friday.

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