A judge delayed the trial Thursday so Edward Romero could be evaluated to determine whether he understands the proceedings against him.
Romero is accused in the shooting death of Alicia Martinez, who disappeared after attending a party at his home in October 2010. Her body was later found in Romero's basement.
Francesca Pagliasotti, who was Romero's girlfriend, is serving a 10-year sentence after being convicted of charges including being an accessory to murder. Prosecutors said she helped clean up the crime scene.
Another woman who prosecutors said took Martinez to the party pleaded guilty to contributing to the delinquency of a minor.
(Copyright 2012 by The Associated Press. All Rights Reserved.)