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Sam Eshaghoff, a student at Emory University, is accused of accepting thousands of dollars from at least six Long Island high school students in exchange for taking their SAT tests for them.
The chairman of the state Senate's Higher Education Committee is planning a hearing on the SAT cheating scandal.
A list of those testifying has yet to be finalized.
LaValle's announcement follows the September arrest of seven current or former students at Great Neck North High School.
Six are accused of paying an older student up to $2,500 to take the SAT exams for them.
All have pleaded not guilty.
The older student attends Emory University in Atlanta. He previously attended the University of Michigan.
LaValle and Nassau County District Attorney Kathleen Rice have expressed concerns about test security procedures.
Rice says her investigation is expanding and more arrests are possible.