Conroy and six fellow students are charged with assaulting Hispanics over 14 months in the Patchogue-Medford area of eastern Long Island.
Conroy's attorney says his client is innocent.
Five of the teens pleaded not guilty last week; the seventh is due in court Tuesday.
All previously pleaded not guilty to hate crime and other charges in the Nov. 8 stabbing.
Lucero's death has prompted a U.S. Justice Department investigation. The teens reportedly told authorities that targeting Hispanics was a regular activity.
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